77 results on '"Tang, Chun"'
Search Results
2. Analysis of output characteristics introduced by non-uniform coolant in direct-liquid-cooled multi-disk laser
- Author
-
Cao Haixia, Xu Ruan, Jianli Shang, Zhang Kai, Ganghua Wang, Yu Ma, Hua Su, Deyuan Shen, Bo Tu, Qiongsong Gao, Tang Chun, Yi Jiayu, and Jing Wu
- Subjects
Materials science ,business.industry ,Oscillation ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Coolant ,law.invention ,010309 optics ,Resonator ,Optics ,Solid-state laser ,law ,0103 physical sciences ,Laser beam quality ,Disk laser ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,business ,Astrophysics::Galaxy Astrophysics ,Beam (structure) - Abstract
The near field of the probe beam after passing through the gain module is measured. The “streamer effect” is first discovered in the experiment, which is characterized as continuity in the flow direction and non-uniformity in the lateral direction with high spatial frequency. To explain the “streamer effect”, a fluid–solid coupling model and an unstable resonator oscillation model of the direct-liquid-cooled thin-disk laser are established. The simulation results show that the non-uniformity of the coolant along the width of the flow channel gives rise to the streamer effect. A feasible cooling channel to achieve a high uniformity coolant is proposed and experimentally verified. At CW pumping of 9.6 kW, the influence of coolant on the output beam quality can be controlled at β
- Published
- 2019
3. A Novel Near-infrared Fluorescence Aptasensor Assay for Ochratoxin A in Traditional Chinese Medicine
- Author
-
曾云龙 Zeng Yun-long, 夏晓东 Xia Xiao-dong, 赵 敏 Zhao Min, 唐春然 Tang Chun-ran, 贺超才 He Chao-cai, 易守军 Yi Shou-jun, and 张 敏 Zhang Min
- Subjects
Ochratoxin A ,chemistry.chemical_compound ,Radiation ,Materials science ,Chromatography ,chemistry ,Traditional Chinese medicine ,Near infrared fluorescence ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2019
4. Study of Synch-Rel Machine for HEV/EV Traction Using Super Inductive Electric Steel
- Author
-
Leyi Zhu and Tang Chun
- Subjects
Electric steel ,Materials science ,020208 electrical & electronic engineering ,0103 physical sciences ,Traction (engineering) ,0202 electrical engineering, electronic engineering, information engineering ,Mechanical efficiency ,02 engineering and technology ,Torque ripple ,010306 general physics ,01 natural sciences ,Automotive engineering - Abstract
This paper presents a new Synch-Rel machine designed with a super-inductive electric steel, and compare with the baseline IPM machine for HEV/EV traction application. The comparisons cover the torque-speed capability, machine size, rotor stress, torque ripple and machine efficiency. The impact of the BH property of electric steel on the Synch-Rel machine performance is also presented.
- Published
- 2020
5. A Novel Aptasensor Assay for Aflatoxin B1 in Traditional Chinese Medicine
- Author
-
赵敏 Zhao Min, 易守军 Yi Shou-jun, 曾云龙 Zeng Yun-long, 唐春然 Tang Chun-ran, 何盼 He Pan, 张敏 Zhang Min, and 程圆昕 Cheng Yuan-xin
- Subjects
Aflatoxin ,Radiation ,Materials science ,Traditional medicine ,Traditional Chinese medicine ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2018
6. Analysis of novel silicon based lateral power devices with floating substrate on insulator
- Author
-
Duan Bao-Xing, Song Kun, Tang Chun-Ping, Yang Yintang, and Wang Yan-Dong
- Subjects
Materials science ,business.industry ,General Physics and Astronomy ,Optoelectronics ,Insulator (electricity) ,Power semiconductor device ,Substrate (printing) ,business ,Silicon based - Abstract
With the rapid development of the traditional inorganic semiconductor industry, the improvement of its electrical performance is gradually approaching to the limit. It is difficult to continue to improve the performance, lessen the size, and reduce the cost. Therefore, organic semiconductor materials and devices with simple process and low cost have been found and gradually become a new research hotspot. Although organic semiconductor materials and devices are developing rapidly, their electrical properties, such as carrier mobility, are considerably inferior to those of inorganic semiconductors, and their research direction and application prospect are relatively fixed and single. They are developed only in display, sensing, photoelectric conversion and other fields, but the researches on switching power devices, integrated circuits and other fields are still relatively blank. At the same time, power devices are used only in the field of inorganic semiconductors. Therefore, in order to expand the research direction of organic semiconductors and power devices at the same time, a novelsilicon on insulator lateral double-diffused metal oxide semiconductor (SOI LDMOS)power device is reported in this paper. Unlike the SOI LDMOS power devices in traditional inorganic semiconductors, this novel device can be used in the field of organic semiconductors by combining with insulated flexible substrates, which provides a new possibility for the research direction of organic semiconductors. In this paper, both simulation and experiment verify that specific on-resistance (RON,sp) and threshold voltage (VTH) do not change significantly when the conventional SOI LDMOS lacks the substrate electrode, but the breakdown voltage decreases by about 15% due to the absence of the substrate electrode or the longitudinal electric field. In response to this phenomenon, in this paper proposed is a novel SOI LDMOS power device that possesses surface substrate electrodes and drift zone oxide trenches. This novel device can provide electrodes for the substrate again, optimize the horizontal and vertical electric field, and significantly change neither of the RON,sp and the VTH. At the same time, the breakdown voltage (BV) of conventional SOI LDMOS is increased by 57.54%, which alleviates the adverse effects caused by the application in the field of organic semiconductors. This novel SOI LDMOS power device provides the possibility of applying traditional power semiconductors to the research of organic semiconductors, and has innovative significance for expanding the organic semiconductor research.
- Published
- 2021
7. Optimized Li storage performance of B, N doped graphyne as Li-ion battery anode materials
- Author
-
Tang Chun-Mei, Zhang Qiu-Yue, and Cai Meng-Yuan
- Subjects
Graphyne ,Battery (electricity) ,Supercapacitor ,Hydrogen storage ,Materials science ,Chemical physics ,Doping ,General Physics and Astronomy ,Lithium-ion battery ,Energy storage ,Anode - Abstract
As the economy grows and the environment deteriorates, the renewable energy is urgently needed. The advanced energy storage technology in electronic equipment, electric vehicle, smart grid, etc. becomes more significant. For example, the rechargeable batteries, hydrogen storage media, supercapacitors, the new energy storage devices have received much attention today. The anodes of the lithium ion battery (LIB), as the main body of charging and discharging, should be most important. The ideal anode material for LIBs is required to possess a higher Li capacity and a lower volume expansion. Good reversibility and high Li capacity are balanced necessarily in the electrode material. The poor cycling performance of LIB is usually due to the severe volume expansion of anode in lithiation/delithiation process. In this paper, the Li storage performance of B and N doped graphyne is explored by using the density functional theory method. The Perdew-Burke-Ernzerhof functional of the generalized gradient approximation is chosen. The calculations indicate that the doping of B atoms can enhance the adsorption strength between the Li atom and the graphyne, which can greatly increase the Li storage capacity. The Li storage capacity of B doped graphyne can reach as high as 2061.62 mAh/g, which is 2.77 times that of pristine monolayer graphyne. Meanwhile, the B doping reduces the out-plane diffusion energy barrier of Li, but increases the in-plane diffusion energy barrier slightly by 0.1 eV. On the other hand, the doping of N atoms reduces the interaction between Li and graphyne, however, the Li capacity also increases to 1652.12 mAh/g because the number of the available Li adsorption sites increases. Moreover, the doping of N atoms greatly improves the diffusion performance of Li on graphyne. The in-plane diffusion energy barrier drops to 0.37 eV, and thus the charge-discharge performance of the N doping graphyne is well improved. Therefore, the doping of B and N atoms can remarkably improve the performance of graphyne as the LIB anodes. The remarkable performance of B and N doped graphdiyne shows that it will become a promising LIB anode in the future. The present research can provide a good theoretical basis and thus conduce to guiding the developing of good Li storage materials, and can also supply strong background for experimental researches.
- Published
- 2019
8. Theoretical Research on Zero-Phonon Line Pumped Yb∶YAG Slab Amplifier at Room-Temperature
- Author
-
李密 Li Mi, 周唐建 Zhou Tangjian, 尚建力 Shang Jianli, 徐浏 Xu Liu, 汪丹 Wang Dan, 邬映臣 Wu Yingcheng, and 唐淳 Tang Chun
- Subjects
Materials science ,Phonon ,Amplifier ,Zero (complex analysis) ,Slab ,Theoretical research ,Line (text file) ,Atomic physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2019
9. 2.62-kW, 30-GHz Linearly Polarized All-Fiber Laser with Narrow Linewidth and Near-Diffraction-Limit Beam Quality
- Author
-
Ma Yi, Sun Yinhong, Yang Xiaobo, Zhu Ri-hong, Peng Wanjing, Chang Zhe, Tang Chun, Wang Yanshan, Zhang Kai, and Wang Jue
- Subjects
Diffraction ,Materials science ,business.industry ,Linear polarization ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Laser linewidth ,Optics ,All fiber ,law ,Laser beam quality ,Limit (mathematics) ,Electrical and Electronic Engineering ,business - Published
- 2019
10. Kilowatt-level direct-'refractive index matching liquid'-cooled Nd:YLF thin disk laser resonator
- Author
-
Bo Tu, Tang Chun, Zhen Cai, Qingsong Gao, Ke Wang, Zhibin Ye, and Chong Liu
- Subjects
Materials science ,business.industry ,Slope efficiency ,Physics::Optics ,02 engineering and technology ,Heat transfer coefficient ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Coolant ,010309 optics ,Resonator ,Optics ,Thin disk ,law ,Optical cavity ,0103 physical sciences ,Laser power scaling ,0210 nano-technology ,business - Abstract
A direct-liquid-cooled Nd:YLF thin disk laser resonator is presented, which features the use of refractive index matching liquid (RIML) as coolant. Highly uniform pump intensity distribution with rectangular shape is realized by using metallic planar waveguides. Much attention has been paid on the design of the gain module, including how to achieve excellent cooling ability with multi-channel coolers and how to choose the doping levels of the crystals for realizing well-distributed pump absorption. The flow velocity of the coolant is found to be a key parameter for laser performance and optimized to keep it in laminar flow status for dissipating unwanted heat load. A single channel device is used to measure the convective heat transfer coefficient (CHTC) at different flow velocities. Accordingly, the thermal stress in the disk is analyzed numerically and the maximum permissible thermal load is estimated. Experimentally, with ten pieces of a-cut Nd:YLF thin disks of different doping levels, a linear polarized laser with an average output power of 1120 W is achieved at the pump power of 5202 W, corresponding to an optical-optical efficiency of 21.5%, and a slope efficiency of 30.8%. Furthermore, the wavefront aberration of the gain module is measured to be quite weak, with a peak to valley (PV) value of 4.0 μm when it is pumped at 5202 W, which enables the feasibility of its application in an unstable resonator. To the best of our knowledge, this is the first demonstration of kilowatt-level direct-‘refractive index matching liquid’-cooled Nd:YLF thin disk laser resonator.
- Published
- 2016
11. Experimental research of fiber coupling based on mini-bar
- Author
-
高松信 Gao Songxin, 谭昊 Tan Hao, 郭林辉 Guo Linhui, 李建民 Li Jianmin, 武德勇 Wu Deyong, and 唐淳 Tang Chun
- Subjects
Materials science ,Bar (music) ,Electrical and Electronic Engineering ,Composite material ,Fiber coupling ,Atomic and Molecular Physics, and Optics ,Experimental research - Published
- 2012
12. District cooling method for thin disk-type laser media
- Author
-
Tang Chun, Feng Guo-Ying, Zhou Shou-Huan, Chen Nianjiang, Yang Huo-Mu, and Mu Jian
- Subjects
Materials science ,Optics ,Thin disk ,law ,business.industry ,District cooling ,Electrical and Electronic Engineering ,Laser ,business ,Atomic and Molecular Physics, and Optics ,law.invention - Published
- 2012
13. kW-output fiber coupled diode laser module
- Author
-
Yin Xinqi, Tang Chun, Wu Deyong, Li Jianmin, Tan Hao, Gao Songxin, and Guo Linhui
- Subjects
Distributed feedback laser ,Materials science ,business.industry ,Physics::Optics ,Atomic and Molecular Physics, and Optics ,Vertical-cavity surface-emitting laser ,Numerical aperture ,Core (optical fiber) ,Optics ,Fiber laser ,Physics::Accelerator Physics ,Cylindrical lens ,Electrical and Electronic Engineering ,business ,Beam (structure) ,Power density - Abstract
The fiber coupled system based on mini-bars is an effective way of avoiding complex beam shaping to reduce costs and improve brightness. Forty mini-bars mounted on copper microchannel heatsink are arranged in two stacks to collimate the output beam of the stacks with the aspherical cylindrical lens and cylindrical lens array in fast and slow axis directions in this paper. For increasing the fill factor of the beams of the stacks, the beams are combined spatially in the fast axis direction. The combined beam could be coupled into the fiber of 800 m core diameter and 0.22 numerical aperture. The opto-optical efficiency of the fiber coupled module is about 58% and the maximum output power is 1360 W with the power density of 1.73105 W/cm2 at fiber output facet.
- Published
- 2012
14. Large aperture tapered fiber phase conjugate mirror in MOPA laser systems with high repetition rate and high pulse energy
- Author
-
Qingsong Gao, Lingling Cui, Zhigang Zhao, Tang Chun, Jun Chen, Chong Liu, and Lixin Tong
- Subjects
Materials science ,Silica fiber ,business.industry ,Amplifier ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Power (physics) ,Pulse (physics) ,Optics ,law ,Brillouin scattering ,Fiber ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,business ,Pulse-width modulation - Abstract
A large aperture tapered fused silica fiber phase conjugate mirror with a maximum 50.7% stimulated Brillouin scattering (SBS) reflectivity is presented, which is operated with 400 Hz pulse repetition rate and 36.5 mJ input pulse energy. To the best of our knowledge, it is the first time that over 50% SBS reflectivity is achieved by using solid-state phase conjugate mirror under such high pulse repetition rate and high pulse energy. With much higher pulse repetition rate of 500 and 1000 Hz, the maximum SBS reflectivity is 41.2% and 33.3%, respectively. A single-longitudinal-mode Nd:YAG laser is experimentally studied with master oscillator power amplifier (MOPA) scheme using such a tapered fiber as a phase conjugate mirror. A 101 mJ pulse energy is achieved at 400 Hz repetition rate, with a pulse width of 6 ns and a M 2 factor of less than 2. The corresponding peak power reaches 16.8 MW.
- Published
- 2011
15. Large power diode laser of phase-change cooling
- Author
-
Wang Hong, Liu Jun, Cao Hongzhang, Tang Chun, Wu Deyong, Gao Songxin, Li Yi, and Yang Bo
- Subjects
Materials science ,Computer cooling ,business.industry ,Schottky diode ,Heat sink ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Vertical-cavity surface-emitting laser ,law ,Heat transfer ,Optoelectronics ,Laser power scaling ,Electrical and Electronic Engineering ,business ,Step recovery diode - Published
- 2011
16. Simulation analysis of 3D dynamic thermo-optic effect of solid state heat capacity laser
- Author
-
冯国英 Feng Guoying, 杨火木 Yang Huomu, 张凯 Zhang Kai, and 唐淳 Tang Chun
- Subjects
Materials science ,law ,Solid-state ,Electrical and Electronic Engineering ,Composite material ,Laser ,Heat capacity ,Atomic and Molecular Physics, and Optics ,law.invention - Published
- 2011
17. Determination of ignition thresholds of laser supported combustion wave and detonation wave based on piezoelectric probe
- Author
-
杨火木 Yang Huomu, 高翔 Gao Xiang, 张凯 Zhang Kai, 唐淳 Tang Chun, 周寿桓 Zhou Shouhuan, 朱海涛 Zhu Haitao, and 冯国英 Feng Guoying
- Subjects
Ignition system ,Materials science ,law ,Acoustics ,Detonation ,Electrical and Electronic Engineering ,Combustion ,Laser ,Piezoelectricity ,Atomic and Molecular Physics, and Optics ,law.invention - Published
- 2011
18. Analysis of periodic cracks in surface layer of pavement structures
- Author
-
Yan Anzhi, Chang Xu, Tang Chun-an, and Mingcheng Liao
- Subjects
Materials science ,business.industry ,General Engineering ,Structural engineering ,Finite element method ,Stress (mechanics) ,Cracking ,Crack closure ,Ultimate tensile strength ,General Materials Science ,Surface layer ,Composite material ,business ,Layer (electronics) ,Elastic modulus - Abstract
As a critical issue for the pavement’s quality service life, surface cracking of the pavement structure is an ongoing research topic which attracts many researchers. This paper presents a numerical study of the periodic cracks in surface layer of pavement structures based on the FEM method. The formation mechanism of the periodic cracks is analyzed and the evolving process is simulated. A parametric study, including effects of the layer thickness, tensile strength of surface layer and layer elastic modulus on the crack spacing is carried out. The numerical results indicate that the horizontal stress between two adjacent cracks decreases gradually as the crack spacing decreases. The horizontal stress transits from tensile to compressive when the crack spacing decreases to a certain value. Such a stress state transition leads to the periodic array of the surface cracks. The evolving process of the periodic cracks indicates that new cracks infill in sequence between two earlier formed adjacent cracks and the crack spacing decreases in half simultaneously. No more new crack can infill when the crack spacing reaches to a certain value even with the increasing of external load. Numerical simulations also show that the crack spacing is strongly dependent on the surface layer thickness, tensile strength of the surface layer and elastic modulus of the surface layer.
- Published
- 2011
19. Optical Characterization of Chemical Vapor Deposited Large-grained Polycrystalline Diamond Films by Raman and Infrared Spectroscopy
- Author
-
顾利萍 Gu Li-ping and 唐春玖 Tang Chun-jiu
- Subjects
Materials science ,Material properties of diamond ,Analytical chemistry ,Infrared spectroscopy ,Diamond ,Chemical vapor deposition ,engineering.material ,Atomic and Molecular Physics, and Optics ,Diamond type ,Full width at half maximum ,symbols.namesake ,Carbon film ,engineering ,symbols ,Raman spectroscopy - Abstract
The relation between macro-properties and micro-quantities of the large-grained polycrystalline chemical vapour deposited diamond films was investigated.Considering the growth non-uniformity,the micro-Raman spectra measured on the top growth surface show large variation from spot to spot.Whereas,the micro-Raman spectra taken on the fine-grained smooth interface of the diamond films show that small deviation and generally can represent the overall quality of the large-grained polycrystaline diamond films,and correlate well with hydrogen content of the film measured by Fourier-transform infrared spectroscopy.It can be concluded that a diamond film with darker color or lower transparency has lower quality and lower phase purity characterized by the larger full width at half maximum(FWHM) and lower intensity of the diamond Raman peak around 1 332 cm-1.
- Published
- 2011
20. Research progress in allsolidstate high power green laser
- Author
-
Sun Yinhong, Tong Lixin, Pang Yu, Gao Qingsong, Ma Yi, Tang Chun, and Pei Zhengping
- Subjects
Materials science ,Green laser ,law ,Amplifier ,All solid state ,Visible radiation ,Electrical and Electronic Engineering ,Laser ,Engineering physics ,Atomic and Molecular Physics, and Optics ,Electronic equipment ,Power (physics) ,law.invention - Published
- 2011
21. 20 kW class high-beam-quality CW laser amplifier chain based on a Yb:YAG slab at room temperature
- Author
-
Tang Chun, Li Mi, Juntao Wang, Zhang Kai, Jianli Sahng, Liu Xu, Cao Liqiang, Rihong Zhu, Dan Wang, Zhou Tangjian, Wu Yingchen, An Xiangchao, Yinglei Du, Qingsong Gao, and Lixin Tong
- Subjects
Diffraction ,Materials science ,business.industry ,Amplifier ,02 engineering and technology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Power (physics) ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Optics ,law ,Fiber laser ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Slab ,Laser beam quality ,business ,Scaling - Abstract
A continuous-wave-operation laser amplifier chain consisting of three multi-concentration-doped Yb:YAG slab gain modules (GMs) at room temperature is presented. The output power of 22.3 kW with the beam quality of 3.3 times the diffraction limit is achieved from this chain. To the best of our knowledge, based on a Yb:YAG slab at room temperature, the highest power to date while maintaining excellent beam quality laser output. An extraction efficiency of 36% from the single slab GM is obtained and can be further enhanced to 46% by optimizing the parameters of GM. These results have confirmed that the Yb:YAG slab has an excellent scaling performance and is suitable for the development of high-average-power lasers.
- Published
- 2018
22. High brightness laser based on Yb:YAG MOPA chain and adaptive optics system at room temperature
- Author
-
Juntao Wang, Jianli Shang, Liu Xu, Xiangchao An, Zhou Tangjian, Long Ou, Tang Chun, Xiang Rujian, Li Mi, Zhao Na, Lu Yanhua, Zhangwen Liu, Honghuan Lin, Wu Yingchen, Yinglei Du, Qingsong Gao, Lixin Tong, Zhang Kai, and Dan Wang
- Subjects
Wavefront ,Diffraction ,Brightness ,Materials science ,business.industry ,Amplifier ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Optics ,law ,Fiber laser ,0103 physical sciences ,Laser beam quality ,0210 nano-technology ,business ,Adaptive optics - Abstract
We demonstrate a master oscillator power amplifier (MOPA) architecture based on Yb:YAG amplifiers and adaptive optics (AO) systems with a high power and high beam quality laser output. With two conduction cooled, dual-end-pumped Yb:YAG zigzag-slab amplifiers at room temperature, the fiber laser of 300 W was scaled to 11.9 kW. Moreover, AO system positioned downstream was utilized to correct wavefront of amplified laser. The beam quality β at maximum output power was 2.8 times diffraction limited with closed-loop AO system.
- Published
- 2018
23. Role of Nitrogen Additive and Temperature on Growth of Diamond Films from Nanocrystalline to Polycrystalline
- Author
-
Cabral Gil, M. C. Carmo, Tang Chun-Jiu, Gu Li-Ping, Pereira Sérgio, Auguste Fernandes, Calisto Hugo, Grácio José, Fu Lianshe, and A.J. Neves
- Subjects
Materials science ,Silicon ,Material properties of diamond ,Biomedical Engineering ,Analytical chemistry ,chemistry.chemical_element ,Diamond ,Bioengineering ,General Chemistry ,Substrate (electronics) ,Chemical vapor deposition ,engineering.material ,Condensed Matter Physics ,Nanocrystalline material ,chemistry ,engineering ,General Materials Science ,Wafer ,Texture (crystalline) - Abstract
In this work, the coupled effect of nitrogen addition into CH4/H2 mixtures and surface temperature on diamond growth ranging from large grained polycrystalline to fine-grained nanocrystalline were investigated. Moreover a new growth parameter window for simultaneous growth of nanocrystalline diamond (NCD) and {100} textured large-grained diamond films was developed by using a high power high pressure 5 kW microwave plasma assisted chemical vapor deposition (MPCVD) reactor. Scanning electron microscope (SEM), Raman spectroscopy, and X-ray diffraction (XRD) are employed to characterize the morphology, crystalline quality and texture of the diamond samples. Our results can be grouped by two catalogs: First, deposition run without and with 0.24% N2 addition, while keeping all the other parameters constant, resulted in a high quality transparent large-grained polycrystalline diamond film and a NCD film, respectively. This result clearly evidences nitrogen induced nanocrystallinity. Then, two different substrate surface temperatures were obtained by overlapping a small silicon slice on the top centre of a large silicon wafer of 5.08 cm in diameter in only one deposition run using 0.24% N2 addition and the same set of parameters as the previous runs. From this growth run, a NCD film of growth rate around 2.3 microm/h was obtained at low temperature, while a {100} textured large-grained diamond film of much higher growth rate about 10.4 microm/h was grown at high temperature. These results not only confirm the reproducibility of NCD by N2 addition, but also indicate that distinct growth modes were involved at different substrate temperatures with 0.24% nitrogen addition, or coupled effect of nitrogen addition and temperature on the growth of CVD diamond films happened. Finite element method (FEM) analysis was employed to simulate the temperature gradient and distribution on these two samples, and based on this simulation and other simulation results in the literature, the growth mechanism is briefly discussed.
- Published
- 2010
24. Design and Experiment on High-Power Direct-Liquid-Cooled Thin-Disk Solid-State Laser
- Author
-
崔玲玲 Cui Lingling, 苏华 Su Hua, 涂波 Tu Bo, 吴晶 Wu Jing, 廖原 Liao Yuan, 高清松 Gao Qingsong, 尚建力 Shang Jianli, 唐淳 Tang Chun, 阮旭 Ruan Xu, 安向超 An Xiangchao, 易家玉 Yi Jiayu, 张凯 Zhang Kai, and 曹海霞 Cao Haixia
- Subjects
Materials science ,Thin disk ,Solid-state laser ,business.industry ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Power (physics) - Published
- 2018
25. Effects of cooling process on qualities of Gem-diamond single crystals
- Author
-
Tang Chun-Juan, Sun Rui-Rui, Liu Li-Na, Zhang Yong-Sheng, Bao Zhi-Gang, Qin Yu-Kun, Li Shangsheng, Jia Xiao-Peng, and Xiao Hong-Yu
- Subjects
Materials science ,business.industry ,General Physics and Astronomy ,Diamond ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,Scientific method ,0103 physical sciences ,engineering ,Optoelectronics ,010306 general physics ,0210 nano-technology ,business - Abstract
In the paper, under 5.6 GPa and 1200-1400℃, the type Ib diamond single crystals on defect-free[111] -oriented seed crystals are synthesized in a cubic anvil under high pressure and high temperature when the crack problem of diamond single crystal appears frequently. Highpurity Fe-Ni-Co solvents are chosen as the catalysts. Highpurity graphite powder (99.99%, purity) is selected as a carbon source. The effects of cooling process on the qualities of Gem-diamond single crystals are studied carefully. First, in order to study the common crack defects of diamond single crystals, using scanning electron microscope (SEM), the surface morphologies of high quality diamond single crystals and crack crystals are obtained respectively. Our SEM test results show that the surfaces of the crack crystals and the high quality crystals are all very smooth. Therefore, the crack crystal problem is not directly caused by the unordered accumulation of carbon. Second, the concentrations of nitrogen in the high quality diamonds and crack crystals are measured by Fourier transform infrared. In our studies, the nitrogen content of the diamond single crystal with crack is similar to the nitrogen content of high quality single crystal, so the appearance of crystal crack is not caused by high impurity content. According to the test results and the regularity of the occurrence of crack crystals, the reasons for the occurrence of crack crystals are analyzed seriously. When the weather conditions such as seasonal change, wind, rain or snowfall are not very stable, the probability of crack crystal problem to appear will increase greatly. In our opinion, the decrease of diamond crystal quality caused by the fluctuation of external growth conditions is the internal cause of crack crystal problem appearing. After growing diamond crystals, choosing the traditional power failure mode and slowing cooling process respectively, the effect of cooling process on the quality of diamond single crystal is investigated. In the season of the crack problem occurring frequently, choosing power failure cooling process, cracks appear in both diamond crystals with 1.3 mm or 6.0 mm in diameter. With the slow cooling process, the synthetic diamond crystals with 1.2 mm or 5.8 mm in diameter are all high-quality single crystals with no cracks inside. The research results show that the slow cooling process can effectively restrain the occurrence of crack crystal problems. In addition, the mechanism problems of crack crystals and the mechanisms of the effects of slow cooling process on diamond crystal qualities are discussed in detail. We believe that the slow cooling process is effective in solving the crack crystal problem, which is mainly attributed to the following two aspects:on the one hand, the slow cooling makes the internal stress of diamond single crystal growing effectively released, which improves the compressive strength of the crystal and the crystal quality as well; on the other hand, the slow cooling makes the solidification process of the catalyst melt slowly, which provides enough time for the crystal to balance the external stress of the catalyst and the equipment, so that the crystals, which are not affected by the unbalanced external stress, are not cracked.
- Published
- 2018
26. High beam quality and high power dual-wavelength laser with VRM
- Author
-
蒋建锋 Jiang Jianfeng, 唐 淳 Tang Chun, 万 敏 Wan Min, 靳全伟 Jin Quanwei, 庞 毓 Pang Yu, 魏 彬 Wei Bing, 谭 亮 Tan Liang, 崔玲玲 Cui Lingling, and 高清松 Gao Qingsong
- Subjects
Optics ,Materials science ,Space and Planetary Science ,business.industry ,Aerospace Engineering ,Dual wavelength laser ,Laser beam quality ,Electrical and Electronic Engineering ,business ,Atomic and Molecular Physics, and Optics ,Power (physics) - Published
- 2018
27. Theoretical Design and Experimental Research on High Power Yb∶YAG Ceramic Slab Laser Amplifier
- Author
-
周唐建 Zhou Tangjian, 汪丹 Wang Dan, 唐淳 Tang Chun, 李建民 Li Jianmin, 邬映臣 Wu Yingcheng, 徐浏 Xu Liu, 吴振海 Wu Zhenhai, 赵娜 Zhao Na, 高清松 Gao Qingsong, 胡浩 Hu Hao, 石勇 Shi Yong, 章健 Zhang Jian, 于益 Yu Yi, and 李密 Li Mi
- Subjects
Materials science ,business.industry ,Amplifier ,visual_art ,visual_art.visual_art_medium ,Slab laser ,Optoelectronics ,Ceramic ,business ,Atomic and Molecular Physics, and Optics ,Experimental research ,Electronic, Optical and Magnetic Materials ,Power (physics) - Published
- 2018
28. Recent progress of key technologies for spectral beam combining of fiber laser with dual-gratings configuration(Invited)
- Author
-
Yanshan Wang, Hong Yan, Wang Shufeng, Li Tenglong, Wanjing Peng, Tang Chun, Yinhong Sun, Zhang Kai, Jianmin Li, and Yi Ma
- Subjects
Materials science ,Aperture ,business.industry ,Physics::Optics ,Aerospace Engineering ,Grating ,Atomic and Molecular Physics, and Optics ,Laser linewidth ,Optics ,Space and Planetary Science ,Fiber laser ,Dispersion (optics) ,Physics::Atomic Physics ,Electronics ,Laser beam quality ,Electrical and Electronic Engineering ,business ,Beam (structure) - Abstract
A spectral beam combination(SBC) system with dual Multi-Layer Dielectric(MLD) grating dispersion compensation configuration, which can combine multiple fiber lasers into a common aperture beam with high beam quality and relax the linewidth requirement of the individual fiber laser, has become gradually one of the most important technique route of fiber laser beam combining. The basic principle and the key technologies of the SBC system with dual-MLD-grating configuration were introduced and analyzed briefly. The recent progress of the main key technologies about high power beam combinable narrow linewidth fiber laser, high power high efficiency short wavelength narrow linewidth fiber laser, large dispersion high efficiency MLD grating and high integration dense beam combining were reviewed. The recent progress on the key technologies of SBC with dual-MLD-configuration in Institute of Applied Electronics, China Academy of Engineering Physics, were also presented. The potential of the SBC with dual-MLD-configuration was prospected.
- Published
- 2018
29. Experimental Investigation on Characteristics of Tapered Fiber Phase-Conjugator with High Repetition Rate and High Pulse Energy
- Author
-
赵智刚 Zhao Zhigang, 刘崇 Liu Chong, 童立新 Tong Lixin, 谢刚 Xie Gang, 高清松 Gao Qingsong, 唐淳 Tang Chun, 陈军 Chen Jun, and 崔玲玲 Cui Lingling
- Subjects
Materials science ,Optics ,Repetition (rhetorical device) ,business.industry ,Phase (waves) ,Fiber ,Electrical and Electronic Engineering ,Pulse energy ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2010
30. Coupled Analysis of Temperature Distribution in Laser Crystals Pumped by Repetitive Pulses
- Author
-
冯国英 Feng Guoying, 唐淳 Tang Chun, 魏泳涛 Wei Yongtao, and 张玉明 Zhang Yuming
- Subjects
Materials science ,Distribution (number theory) ,law ,Electrical and Electronic Engineering ,Laser ,Molecular physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention - Published
- 2010
31. Diode Laser Side Pumped kW-Class Nd:YAG Slab Laser
- Author
-
lv wen-qiang, Tang Chun, jiang jian-feng, Zhao Na.Wu Yingchen, tu bo, Hu Hao, and Lei Jun
- Subjects
Materials science ,business.industry ,Far-infrared laser ,Laser pumping ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Gain-switching ,law.invention ,Vertical-cavity surface-emitting laser ,X-ray laser ,Optics ,law ,Diode-pumped solid-state laser ,Electrical and Electronic Engineering ,business ,Diode - Published
- 2010
32. Study of Uniform Pumping and Uniform Cooling on Thin Disk Laser
- Author
-
Yao Zhen-yu, jiang jian-feng, Tang Chun, Tu BoJin Quanwei, Zhao Na, Cai Zhen, and Wang Xiaojun
- Subjects
Optics ,Materials science ,Thin disk ,law ,business.industry ,Electrical and Electronic Engineering ,Laser ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention - Published
- 2010
33. All-Solid-State High Pulse Repetition Rate High Pulse Energy Single-Longitudinal-Mode MOPA Laser System with Solid-State Phase Conjugating Mirror
- Author
-
Tong Lixin, Cui Ling-ling, Tang Chun, Zhao Zhigang, Liu Chong, Chen Jun, and Gao Qingsong
- Subjects
Femtosecond pulse shaping ,Materials science ,Repetition (rhetorical device) ,business.industry ,Phase (waves) ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Pulse (physics) ,law.invention ,Longitudinal mode ,Optics ,Multiphoton intrapulse interference phase scan ,law ,All solid state ,Electrical and Electronic Engineering ,business - Published
- 2010
34. Sodium Guidestar Laser Based on High-Efficiency PPSLT Quasi-Phase-Matched Sum Frequency Generation
- Author
-
魏彬 Wei Bin, 王卫民 Wang Weimin, 唐淳 Tang Chun, 鲁燕华 Lu Yanhua, 张雷 Zhang Lei, 高松信 Gao Songxin, 刘东 Liu Dong, and 马毅 Ma Yi
- Subjects
Sum-frequency generation ,Materials science ,business.industry ,Sodium ,Phase (waves) ,chemistry.chemical_element ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Optics ,chemistry ,law ,business - Published
- 2010
35. Kilowatt High Power Heat Capacity Laser with 3 Times Diffraction Limit
- Author
-
唐淳 Tang Chun, 胡浩 Hu Hao, 蒋建锋 Jiang Jianfeng, 张凯 Zhang Kai, 周唐建 Zhou Tangjian, 蔡震 Cai Zhen, 曹丁象 Cao Dingxiang, and 涂波 Tu Bo
- Subjects
Diffraction ,Watt ,Materials science ,business.industry ,Laser ,Heat capacity ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Power (physics) ,law.invention ,Optics ,law ,Limit (mathematics) ,Electrical and Electronic Engineering ,business - Published
- 2009
36. All-Solid-State Narrow Linewidth Sodium Guide Star Laser
- Author
-
马毅 Ma Yi, 王卫民 Wang Weimin, 唐淳 Tang Chun, 刘东 Liu Dong, 张雷 Zhang Lei, and 鲁燕华 Lu Yanhua
- Subjects
Materials science ,Sodium ,chemistry.chemical_element ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Laser linewidth ,chemistry ,law ,All solid state ,Guide star ,Electrical and Electronic Engineering ,Atomic physics - Published
- 2009
37. 400 Hz All-solid-state Sum-Frequency Sodium Guidestar Laser
- Author
-
王卫民 Wang Weimin, 刘东 Liu Dong, 马毅 Ma Yi, 张雷 Zhang Lei, 鲁燕华 Lu Yanhua, and 唐淳 Tang Chun
- Subjects
Materials science ,chemistry ,law ,Sodium ,All solid state ,Analytical chemistry ,chemistry.chemical_element ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention - Published
- 2009
38. Fractural process and toughening mechanism of laminated ceramic composites
- Author
-
Tang Chun-an, Liang Zhenzao, Zhang Yafang, and Zhang Yong-bin
- Subjects
Coalescence (physics) ,Toughness ,Materials science ,Computer simulation ,Mechanical Engineering ,Computational Mechanics ,Toughening ,Physics::Geophysics ,Acoustic emission ,Mechanics of Materials ,visual_art ,Crack initiation ,visual_art.visual_art_medium ,Ceramic ,Composite material - Abstract
Based on the model of multi-layer beam and the assumption of micro-inhomogeneity of material, the 3D fractural characteristics of laminated ceramic composites have been studied with numerical simulation. Under three-point bending load, crack initiation, coalescence, propagation, tuning off in the weak interface and final rupture have been simulated. The spatial distribution and evolution process of acoustic emission are also presented in the paper. The simulation verifies the primary mechanism of the weak interface inducing the crack to expand along there and absorbing the fractural energy. The disciplinary significance of the effect of strength and properties of material on the toughness and strength of laminated ceramic composites is, therefore, discussed in this paper.
- Published
- 2007
39. Nd:YAG thin-disk laser with large dynamic range unstable resonance
- Author
-
An Xiangchao, Yu Yi, Shang Jianli, Tang Chun, and Qingsong Gao
- Subjects
Materials science ,business.industry ,Laser ,law.invention ,Round-trip gain ,Optical pumping ,Lens (optics) ,Optics ,Thin disk ,law ,Focal length ,Laser power scaling ,Disk laser ,business - Abstract
In this paper, based on the self-reproduction condition of laser wavefront curvature, the influences of disk defocus on laser parameters can be calculated. The laser-pumping overlapping efficiency will decrease by 9%; the magnification will rise to 2.3, and the intra-cavity loss will be high to 30% due to a laser beam size mismatch when each disk has focal length of -100 m in a positive-branch confocal unstable resonator containing four disks with magnification of 1.8. Therefore, the optical conversion efficiency and stability will be reduced significantly. Several methods defocus compensation of are compared, it can be found that inserting variable-focus lens in resonant is useful in large dynamic range. In experiment, the defocus values are measured in different pumping power. A lens group, used for compensate components according to the single pass probe, is carefully designed. Under this compensation, the pulse energy can be maintained in 10 J from 1 Hz to 100 Hz. The output power can be improved 2.33 times compared to non-compensation condition.
- Published
- 2015
40. Electrochemical performance of PEM fuel cell with Pt–Ru electro-catalyst layers deposited by sputtering
- Author
-
Jenn-Jiang Hwang, Da-Yung Wang, Tang-Chun Chang, Chi-Lung Chang, and Wei-Yu Ho
- Subjects
Materials science ,Electrolytic cell ,Analytical chemistry ,Proton exchange membrane fuel cell ,Surfaces and Interfaces ,General Chemistry ,Sputter deposition ,Condensed Matter Physics ,Electrochemistry ,Surfaces, Coatings and Films ,Operating temperature ,Chemical engineering ,Sputtering ,Electrode ,Materials Chemistry ,Polarization (electrochemistry) - Abstract
In this paper, we investigated the performance of the single fuel cell with four gas diffusion electrodes with differently structured Pt–Ru electro-catalyst layers, as deposited by sputtering. The effects of the structural design of the Pt–Ru catalyst are discussed with reference to I–V polarization curves. Experimental results indicate that the performance of the fuel cell was affected by the microstructure of the sputter-deposited Pt–Ru layers on the E-TEK carbon clothes electrodes, the gas pressure, the operating temperature and the internally humidified temperatures. In the study range, the performance of the fuel cell is improved as the gas pressure, operating temperatures and the internal temperature increased. The measured I–V polarization curves reveal that the best performance of the designed layer electrodes was exhibited by model II with Pt/Ru multilayers, at a gas pressure of 200 KPa, a fuel cell operating temperature of 70 °C and an internally humidified temperature of 60 °C. The efficiencies of single cells with various structural designs follow the descending order model II, model III, model IV and model I.
- Published
- 2006
41. Assignment of Photoelectron Spectra of MC 2 (M= V, Cr, Fe, and Co)
- Author
-
Tang Chun-Mei, Liu Yu-Zhen, Yuan Yong-Bo, and Deng Kai-Ming
- Subjects
Materials science ,Photoemission spectroscopy ,General Physics and Astronomy ,Charge (physics) ,Molecular physics ,Electric charge ,Spectral line ,Excited state ,Physics::Atomic and Molecular Clusters ,Molecule ,Density functional theory ,Physics::Chemical Physics ,Atomic physics ,Mulliken population analysis - Abstract
Hybrid density functional theory (DFT) calculations are performed to study MC2 (M= V, Cr, Fe and Co) clusters in the neutral and anionic charge states. We find that the equilibrium geometries of MC2 and their anions are all cyclic structures with C2v symmetry, which agrees well with the previous theoretical studies. The Mulliken charge and spin populations of MC2 clusters and their anions are also calculated, and it is found that the electron charge transformations from anions to neutral molecules mainly take place on the M atoms. Time-dependent DFT is used to calculate the excited states, and a theoretical assignment for the features in the experimental photoelectron spectrum is given, which are in good agreement with the available experimental data.
- Published
- 2006
42. Numerical simulation on failure process in brittle and heterogeneous matrix filled with randomly distributed particles
- Author
-
Tang Chun-an, Liu Hao, and Zhang Yafang
- Subjects
Coalescence (physics) ,Materials science ,Brittleness ,Particle properties ,Computer simulation ,Composite number ,Crack initiation ,Uniaxial tension ,General Materials Science ,Composite material ,Failure mode and effects analysis - Abstract
Based on an essential assumption of meso-heterogeneity of material, the macro characteristic of composite reinforced with particles, the crack initiation, propagation and the failure process in composite were studied by using a numerical code. The composite is subjected to a uniaxial tension, and stiff or soft particles are distributed at random manner but without overlapping or contacting. The effect of reinforcement particle properties on the fracture process and mechanism of composite with brittle matrix, furthermore, the influence of the particle volumetric fraction is also investigated. Numerical results present the different failure mode and re-produce the crack initiation, propagation and coalescence in brittle and heterogeneous matrix. The mechanism of such failure was also elucidated.
- Published
- 2006
43. Light‐Driven Reversible Intermolecular Proton Transfer at Single‐Molecule Junctions.
- Author
-
Cai, Shuning, Deng, Wenting, Huang, Feifei, Chen, Lijue, Tang, Chun, He, Wenxiang, Long, Shichuan, Li, Ruihao, Tan, Zhibing, Liu, Junyang, Shi, Jia, Liu, Zitong, Xiao, Zongyuan, Zhang, Deqing, and Hong, Wenjing
- Subjects
INTRAMOLECULAR proton transfer reactions ,CHARGE transfer ,PROTONS - Abstract
Photoresponsive molecular systems are essential for molecular optoelectronic devices, but most molecular building blocks are non‐photoresponsive. Employed here is a photoinduced proton transfer (PIPT) strategy to control charge transport through single‐molecule azulene junctions with visible light under ambient conditions, which leads to a reversible and controllable photoresponsive molecular device based on non‐photoresponsive molecules and a photoacid. Also demonstrated is the application of PIPT in two single‐molecule AND gate and OR gate devices with electrical signal as outputs. Out of the blue: By using a photoinduced proton‐transfer (PIPT) strategy, a non‐photoresponsive 1,3‐azulene derivative can be modulated in single‐molecule junctions by blue light, with conductance variation by almost one order of magnitude. This behavior can lead to potential applications in single‐molecule logic gate devices with electrical outputs. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
44. Influences of bias voltage on properties of TiAl-doped DLC coatings synthesized by cathodic arc evaporation
- Author
-
Wei-Yu Ho, Jui-Yun Jao, Tang-Chun Chang, Da-Yung Wang, and Chi-Lung Chang
- Subjects
Auger electron spectroscopy ,Materials science ,Mechanical Engineering ,Analytical chemistry ,General Chemistry ,engineering.material ,Microstructure ,Evaporation (deposition) ,Electronic, Optical and Magnetic Materials ,Lubricity ,X-ray photoelectron spectroscopy ,Coating ,Physical vapor deposition ,Materials Chemistry ,engineering ,Electrical and Electronic Engineering ,Composite material ,Tribometer - Abstract
In this work, the combinations of TiAl-doped DLC (Diamond-like Carbon) and TiAlN/TiN double-layered films were designed to deposit on the tool steels using cathodic arc evaporation in a single process. The economic advantage in depositing the combined coating in one production scale PVD coating system is of practical importance. The TiAl-doped DLC as lubricant coatings were synthesized with TiAl-target arc sources to emit ion plasma to activate acetylene reactive gases. Scanning electron microscopy (SEM), Auger electron spectroscopy (AES), micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) techniques were employed to analysis the microstructure properties of TiAl-doped DLC coatings. Vicker's and tribometer tester were used to measure the mechanical properties of TiAl-doped DLC coatings. The results show that the TiAl-doped DLC coatings retained lower friction coefficient at approximately 0.15 during the steady state sliding. The lubricity and wear resistance of TiAl-doped DLC coatings is then demonstrated to potentially be applied to the cutting tools with no lubricants.
- Published
- 2005
45. The impermeability mechanism of self-compacting water proof concrete
- Author
-
Tang Chun-an, Li Sinian, Xiong Jian-min, and Li Huoxiang
- Subjects
Mechanism (engineering) ,Materials science ,Aggregate (composite) ,Mockup ,Fly ash ,Superplasticizer ,General Materials Science ,Crack resistance ,Geotechnical engineering ,Fiber - Abstract
The impermeability mechanism of water-proof self-compacting concrete (WPSCC) was studied. The mechanism and influential factors, such as water-cement ratio (w/c), dosage of powder, superplasticizer, sand content, aggregate content, fly ash, UEA, PP fiber, on compactibility and crack resistance of WPSCC were analyzed. A type of WPSCC successfully applied in tunnel liner with its validities, conveniences and economies by mockup test was developed and optimized. Experimental results show that the WPSCC has good workability, mechanical properties and impermeability when reasonable requirements are fulfilled.
- Published
- 2005
46. Packaging technique of CW 100 W quantum-well diode laser
- Author
-
武德勇 Wu Deyong, 高松信 Gao Songxin, 唐淳 Tang Chun, 郭林辉 Guo Linhui, 吕文强 Lü Wenqiang, and 雷军 Lei Jun
- Subjects
X-ray laser ,Materials science ,law ,business.industry ,Optoelectronics ,Electrical and Electronic Engineering ,Laser ,business ,Atomic and Molecular Physics, and Optics ,Quantum well ,law.invention ,Diode ,Vertical-cavity surface-emitting laser - Published
- 2010
47. Research on High Power Slab Laser Technology with Dual Doped Concentration
- Author
-
赵娜 Zhao Na, 周唐建 Zhou Tangjian, 胡浩 Hu Hao, 汪丹 Wang Dan, 陈小明 Chen Xiaoming, 邬映臣 Wu Yingchen, 吕文强 Lü Wenqiang, 李密 Li Mi, 李建民 Li Jianmin, 唐淳 Tang Chun, and 雷军 Lei Jun
- Subjects
Optics ,Materials science ,business.industry ,Doping ,Slab laser ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Dual (category theory) ,Power (physics) - Published
- 2016
48. Edge Distortion Suppressing in Nd∶YAG Slab Laser
- Author
-
李建民 Li Jianmin, 石勇 Shi Yong, 赵娜 Zhao Na, 雷军 Lei Jun, 唐淳 Tang Chun, 邬映臣 Wu Yingchen, 胡浩 Hu Hao, 周唐建 Zhou Tangjian, 陈小明 Chen Xiaoming, 吕文强 Lü Wenqiang, and 李密 Li Mi
- Subjects
Materials science ,Optics ,business.industry ,Distortion ,Slab laser ,Edge (geometry) ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2016
49. Modelling of surface PM machine using soft magnetic composites and a bonded magnet ring
- Author
-
Wen L. Soong, Gene S. Liew, Tang Chun, and Nesimi Ertugrul
- Subjects
Inductance ,Materials science ,Electropermanent magnet ,Dipole magnet ,Stator ,law ,Magnet ,Cogging torque ,Torque ,Mechanical engineering ,Permanent magnet synchronous generator ,Composite material ,law.invention - Abstract
This paper examines the modelling of a 1.6 kW, 3,000 rpm surface permanent magnet machine which was constructed using soft magnetic composites (SMC) stator tooth segments and a bonded rare-earth magnet ring. It was designed for high torque density and efficiency, and low cogging torque. Both 2D and 3D finite-element model results are provided and compared to the experimental measurements of the flux densities, back-EMF, cogging torque, inductance and power losses. Challenges were found in modelling the magnetization of the bonded-ring magnet. The rated efficiency and field-weakening performance are examined by using both measured and finite-element calculated parameters.
- Published
- 2012
50. Tapered fiber phase conjugator for high-power all-solid lasers with high repetition rate
- Author
-
Zhigang Zhao, Chong Liu, Qingsong Gao, Lingling Cui, Gang Xie, Lixin Tong, Tang Chun, and Jun Chen
- Subjects
Materials science ,business.industry ,Phase (waves) ,Laser ,law.invention ,Longitudinal mode ,Optics ,law ,Fiber laser ,Laser beam quality ,Fiber ,business ,Phase conjugation ,Pulse-width modulation - Abstract
A high power multi-pass diode-pumped solid-state MOPA system with large core diameter tapered quartz fiber as phase conjugator is experimentally investigated. The results of the effects of laser longitudinal mode characteristic, laser pulse width and fiber surface optical quality on SBS reflectivity are presented. Maximum SBS reflectivity of 69.7% is obtained with the repetition rate of 1000 Hz, input pulse energy of 38mJ and pulse width of 24 ns. The phase conjugator is made from a taper shaped quartz fiber with the diameter of 1mm at the input end and 0.4mm at the other end. It has good application prospects in improving the beam quality and compressing the pulse width for high power laser system with high repetition rate.
- Published
- 2012
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.