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25. 17.8??fs broadband Kerr-lens mode-locked Yb:CALGO oscillator

Author

Wang, Yiran, Su, Xiancui, Xie, Yiyan, Gao, Feilong, Kumar, Santosh, Wang, Qinglin, Liu, Cailong, Zhang, Bingyuan, Zhang, Baitao, and He, Jingliang

Abstract

Pulses as short as 17.8 fs with a spectral bandwidth of 145 nm and central wavelength of 1118 nm have been generated from a Kerr-lens mode-locked Yb:CALGO oscillator. The oscillator operating at an average power of 26 mW and a repetition rate of 95.9 MHz is pumped by a cost-effective single-mode fiber coupled laser diode emitting 800 mW at 976 nm. The dispersion is compensated using a prism pair combined with broadband chirp mirrors. To the best of our knowledge, the pulse durations corresponding to approximately 4.8 optical cycle pulses are the shortest achieved durations through a Yb-doped bulk oscillator.

Published
2021

36. Direct diode-pumped 58fs Yb:Sr3Y2(BO3)4 laser

Author

Lou, Fei, primary, Sun, Shijia, additional, He, Jingliang, additional, Zhao, Ruwei, additional, Li, Jing, additional, Su, Xiancui, additional, Lin, Zhoubin, additional, Zhang, Baitao, additional, and Yang, Kejian, additional

Published
2016
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45. High-peak-power passively Q-switched 1.3??μm Nd:YAG/V^3+:YAG laser pumped by a pulsed laser diode

Author

Wang, Zhaowei, Zhang, Baitao, Ning, Jian, Zhang, Xiaotong, Su, Xiancui, and Zhao, Ruwei

Abstract

We demonstrate a high-pulse-energy, short-pulse-width passively Q-switched (PQS) Nd:YAG/V^3+:YAG laser at 1.3 μm, which is end-pumped by a pulsed laser diode. During the PQS regime, a maximum total output pulse energy of 3.3 mJ is obtained under an absorbed pump pulse energy of 21.9 mJ. Up to 400 μJ single-pulse energy is realized with the shortest pulse width of 6.16 ns and a pulse repetition frequency of 34.1 kHz, corresponding to a peak power of 64.9 kW. The high-energy laser pulse is operated in the dual wavelengths of 1319 and 1338 nm, which is a potential laser source for THz generation.

Published
2015

46. Sub-50-fs Kerr-lens mode-locked Yb-doped fluoride laser with 44% optical efficiency.

Author

Su X, Wang Y, Su L, Liu S, Zheng L, Zhang B, He J, and Zhang B

Abstract

Yb-doped fluoride has been demonstrated to be potential crystals for application in efficient ultrafast lasers. However, the trade-off between the shorter pulses with higher efficiencies is a challenge. In this work, using Y b , G d : C a S r F 2 crystal, we report on a sub-50-fs Kerr-lens mode-locked oscillator with an optical efficiency up to 44%. Pumped by a 976-nm diffraction-limited fiber laser and using chirped mirrors combined with prism pairs for the dispersion compensation, a pulse as short as 46 fs was obtained with 620-mW output power, corresponding to an optical efficiency more than 40%. Stable Kerr-lens mode-locking with RMS of output power lower than 0.3% and beam quality factors M 2 <1.14 were achieved. Moreover, a maximum output power of 780 mW was obtained in continuous-wave operation with 55.3% optical efficiency. To the best of our knowledge, the results in this work represent the shortest pulses generated from Yb-doped fluoride lasers as well as the highest optical efficiencies ever reported in sub-100 fs Yb bulk lasers.

Published
2024
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47. Sub-100-fs Kerr-lens mode-locked Yb:Lu 2 O 3 laser with more than 60% optical efficiency.

Author

Su X, Wang Y, Yin Y, Wang M, Zhang B, He J, and Zhang B

Abstract

Yb-doped sesquioxides represent one of the most excellent laser crystals applying for high-power ultrafast lasers owing to their very high thermal conductivities and broadband emission spectra. Pumped by a high-brightness Yb-fiber laser at 976 nm, the Yb:Lu 2 O 3 laser delivers a maximum output power that amounts to 3.55 W in the continuous-wave regime with an optical efficiency of 75%. In the mode-locked regime, 90-fs pulses were generated via soft-aperture Kerr-lens mode-locking at 1080.6 nm with an average output power of 2.85 W, which corresponds to an optical efficiency of 60.3% and a slope efficiency of 68.8%. Average output power of the mode-locked Yb:Lu 2 O 3 laser can be further scaled to 3.05 W at the expense of the pulse duration (178 fs), which corresponds to an optical efficiency as high as 64.5%. To the best of our knowledge, it is the highest optical efficiency ever reported from any solid-state Kerr-lens mode-locked Yb lasers.

Published
2024
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48. Sub-60-fs ultralow threshold and efficient Kerr-lens mode-locked Yb,Gd:CaSrF 2 laser.

Author

Su X, Wang Y, Li G, Su L, Liu S, Zheng L, Zhang B, and Zhang B

Abstract

In this Letter, using a Yb,Gd:CaSrF 2 co-doping mixed crystal, an ultra-low threshold and efficient Kerr-lens mode-locked femtosecond oscillator is realized with a mode-locking threshold as low as 150 mW. With a 200-mW pump power, the shortest pulses are obtained with a pulse duration of 57 fs. A maximum mode-locked output power of 185 mW is observed under a 500-mW pump power, corresponding to an optical-to-optical efficiency of up to 37%. To the best of our knowledge, the 150-mW threshold is the lowest pump power to realize Kerr-lens mode-locking operation in Yb-doped bulk lasers. Furthermore, an optical efficiency of 37% is the highest efficiency in Yb-doped fluoride bulk lasers to date. Our results provide a new basis for high-efficiency and low-threshold Yb-doped ultrafast bulk lasers.

Published
2022
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49. Biaxial crystal β-BaTeMo 2 O 9 : theoretical analysis and the feasibility as high-efficiency acousto-optic Q-switch.

Author

Wu Q, Gao Z, Tian X, Su X, Li G, Sun Y, Xia S, He J, and Tao X

Abstract

The high efficiency acousto-optic modulators become indispensable in photonics and optoelectronics for the pulse generation and signal modulation in optical display and telecommunications. In this paper, the validity and feasibility of the biaxial crystals as acousto-optic mediums have been theoretically analyzed and confirmed by experiments using a biaxial crystal of β-BaTeMo 2 O 9 . The diffraction angle and diffraction efficiency of the β-BaTeMo 2 O 9 acousto-optic Q-switch are determined to be 1.420° and 78.1%, which are comparable with that of TeO 2 acousto-optic modulator at the identical operating wavelength of 1064 nm and 100 MHz, respectively. The minimum of the modulated pulse width can be achieved to be 6 ns at 5 kHz with Nd:YVO 4 as the gain medium. The results not only provide an excellent acousto-optic medium, but also explore the field of biaxial acousto-optic medium for device fabrications.

Published
2017
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50. Few-layered ReS 2 as saturable absorber for 2.8  μm solid state laser.

Author

Su X, Nie H, Wang Y, Li G, Yan B, Zhang B, Yang K, and He J

Abstract

A novel two-dimensional (2D) material member in the transition metal dichalcogenides family, few-layered rhenium disulfide (ReS 2 ) was prepared by liquid phase method successfully. By using the open-aperture Z-scan method, the saturable absorption properties at 2.8 μm were characterized with a saturable fluence of 22.6  μJ/cm 2 and a modulation depth of 9.7%. A passively Q-switched solid-state laser at 2.8 μm was demonstrated by using the as-prepared ReS 2 saturable absorber successfully. Under an absorbed pump power of 920 mW, a maximum output power of 104 mW was obtained with a pulse width of 324 ns and a repetition rate of 126 kHz. To the best of our knowledge, this is the first demonstration of applying ReS 2 in an all-solid-state laser. Moreover, this represents the shortest pulses in Q-switched MIR lasers based on a 2D material as the saturable absorber, which demonstrated the superiority of ReS 2 acting as an optical modulator for generating short-pulsed lasers. The results well prove that 2D ReS 2 is a reliable optical modulator for MIR solid-state lasers.

Published
2017
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