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88 results on '"Shao, Jianda"'

1. Advances in space laser coating for space exploration

Author

WANG Zhihao, WANG Yanzhi, SHEN Zicai, HE Hongbo, and SHAO Jianda

Subjects
space laser, space radiation, laser coating, gravitational wave detection, deep space, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

With the advancement of space laser technology，laser systems are progressing towards shorter wavelengths，longer lifetimes，and higher orbits. It requires higher performance coatings that can withstand the damage caused by the harsh space environment，such as vacuum，high and low temperatures，proton radiation and Gamma-ray radiation. This paper reviews the development direction of the main space lasers at home and abroad. It also discusses the effects of the space environment on coatings during the development of space laser systems and the evolution mechanism of coating performance under service conditions. It presents the new advances in high-performance space laser coatings and provides insights into future development directions，such as gravitational wave detection in space and deep space exploration.

Published
2024
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6. Intensity-tunable achromatic cascade liquid crystal Pancharatnam-Berry lens

Author

Mo, Zhichang, primary, Zhao, Yuanan, additional, Wang, Jianguo, additional, Liu, Xiaofeng, additional, Cheng, Changjie, additional, Chen, Yi, additional, Zhu, Xiangyu, additional, Zhao, Yadi, additional, Wang, Kun, additional, Ou, Shaozhong, additional, Zhang, Zhouhao, additional, Cao, Zhaoliang, additional, Cao, Qing, additional, and Shao, Jianda, additional

Published
2024
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15. Investigations on nano-absorbing precursors in the picosecond regime via the comparative study of HfO₂/SiO₂ and Ta2O₅/SiO₂ high-reflectivity coatings damage

Author

Gong, He, primary, Liu, Xiaofeng, additional, Tao, chunxian, additional, Zhao, Yuanan, additional, Shuai, Kun, additional, Li, Dawei, additional, Zhang, Weili, additional, Sun, Jian, additional, Zhou, Li, additional, Jiang, Youen, additional, Yun, Cui, additional, Zhang, Dawei, additional, Dai, Yaping, additional, and Shao, Jianda, additional

Published
2023
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23. Nanosecond laser conditioning of multilayer dielectric gratings for picosecond–petawatt laser systems

Author

Shuai, Kun, primary, Zhao, Yuanan, additional, Liu, Xiaofeng, additional, Lin, Xiangkun, additional, Xia, Zhilin, additional, Qiu, Keqiang, additional, Li, Dawei, additional, Gong, He, additional, Zhou, Yan, additional, Sun, Jian, additional, Zhou, Li, additional, Jiang, Youen, additional, Dai, Yaping, additional, and Shao, Jianda, additional

Published
2023
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27. Broadband 1T-polytype tantalum disulfide saturable absorber for solid-state bulk lasers

Author

Wang, Mengxia, primary, Qiu, Hailong, additional, Yang, Tianwen, additional, Wang, Zhengping, additional, Zhao, Chuanrui, additional, Zhao, Yuanan, additional, Yu, Ting, additional, Jiang, Yuyao, additional, Chen, Meiling, additional, Lian, Yafei, additional, Zhang, Ge, additional, Liu, Hongjun, additional, Hu, Zhanggui, additional, and Shao, Jianda, additional

Published
2022
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39. Multifunctional highly dispersive mirror for fiber oscillator

Author

Zhang, Yuhui, primary, Wang, Yanzhi, additional, Wei, Xiaoming, additional, Wang, Wenlong, additional, Ling, Lin, additional, Chen, Ruiyi, additional, Wang, Zhihao, additional, Chen, Chang, additional, Shao, Yuchuan, additional, He, Hongbo, additional, and Shao, Jianda, additional

Published
2021
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48. Neural network modeling and prediction of HfO2thin film properties tuned by thermal annealing

Author

Gao, Min, Yin, Chaoyi, Shao, Jianda, and Zhu, Meiping

Abstract

AbstractPlasma-enhanced atomic layer deposition (PEALD) is gaining interest in thin films for laser applications, and post-annealing treatments are often used to improve thin film properties. However, research to improve thin film properties is often based on an expensive and time-consuming trial-and-error process. In this study, PEALD-HfO2thin film samples were deposited and treated under different annealing atmospheres and temperatures. The samples were characterized in terms of their refractive indices, layer thicknesses and O/Hf ratios. The collected data were split into training and validation sets and fed to multiple back-propagation neural networks with different hidden layers to determine the best way to construct the process–performance relationship. The results showed that the three-hidden-layer back-propagation neural network (THL-BPNN) achieved stable and accurate fitting. For the refractive index, layer thickness and O/Hf ratio, the THL-BPNN model achieved accuracy values of 0.99, 0.94 and 0.94, respectively, on the training set and 0.99, 0.91 and 0.90, respectively, on the validation set. The THL-BPNN model was further used to predict the laser-induced damage threshold of PEALD-HfO2thin films and the properties of the PEALD-SiO2thin films, both showing high accuracy. This study not only provides quantitative guidance for the improvement of thin film properties but also proposes a general model that can be applied to predict the properties of different types of laser thin films, saving experimental costs for process optimization.

Published
2024
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49. Thermal stability of triple-junction gallium arsenide cells.

Author

Feng Y, Wang Y, Lu Y, Wang Z, Liu C, Chen Y, He H, and Shao J

Abstract

Laser wireless power transmission (LWPT) systems have significant applications in the field of wireless energy transmission, including spacecraft sensor networks, satellite-to-satellite communication, and remote power supply. However, continuous laser exposure increases the temperature of the photovoltaic (PV) cells in the LWPT system, thus decreasing the electrical output performance. This work, which we believe is a new approach, is on the basis of a notch film designed by a combined merit function proposed to maintain the electrical output performance while under 1064-nm continuous laser irradiation. Moreover, the thermal stability of PV cells under laser irradiation was investigated, which revealed the recoverability of the open-circuit voltage (Voc) of the cells at different temperatures, and the thermal damage to cells was a gradual process. This process began with the vaporization of the encapsulation adhesive, followed by a decline in, but still recoverable and functional, electrical performance, and finally, the cell was completely damaged. The thermal stability of the PV cells coated with the notch film increased ten-fold compared to those without it. Furthermore, the correlation between the minimum Voc and maximum temperature of the cells with notch films of different performances was established. These investigations serve as references for further optimization of LWPT.

Published
2024
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50. Fast, intelligent and high-precision adaptive null interferometry for optical freeform surfaces by backpropagation.

Author

Lu Q, Gong W, Sun Y, Wang W, Zhang X, Wang P, Ding Y, Wang W, Liu S, Zhang X, Xu M, and Shao J

Abstract

In the past 10 years, adaptive wavefront interferometry (AWI) has been employed for measuring freeform surface profiles. However, existing AWI techniques relying on stepwise and model-free stochastic optimizations have resulted in inefficient tests. To address these issues, deterministic adaptive wavefront interferometry (DAWI) is firstly introduced in this paper based on backpropagation (BP), which employs a loss function to simultaneously reconstruct and sparsify initial incomplete interferometric fringes until they are nulled. Each iteration of BP requires two phase shifts. Through simulations, we have verified that freeform wavefront error with a peak-to-valley (PV) of up to 168 λ can be fully compensated in tens of iterations using a 1024 × 1024 pixel area of a liquid-crystal spatial light modulator. In experiments, we accomplished a null test of a freeform surface with 80% missing interference fringes in 39 iterations, resulting in a surface profile error PV of 66.22 λ and measurement error better than λ/4. The DAWI has at least 20 times fewer iterations in fringe reconstruction than the 3-step AWI methods, and nearly an order of magnitude fewer iterations in the whole process, paving the way for significantly enhanced efficiency, generality and precision in freeform surface adaptive interferometry.

Published
2024
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