Dr. Baozhu Yan Profile

Dr. Baozhu Yan

at National Univ of Defense Technology

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Author

Publications (8)

Proceedings Article | 17 April 2020 Paper

Measurements on LP modes of the photonic lantern

Tian Chen, Wenguang Liu, Kun Xie, Junyu Chai, Huan Yang, Qiong Zhou, Baozhu Yan

Proceedings Volume 11455, 114555G (2020) https://doi.org/10.1117/12.2565065

KEYWORDS: Optical fibers, Spatial light modulators, Multimode fibers, Optical filters, Single mode fibers

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Proceedings Article | 12 December 2018 Paper

Modeling for the thermal stress damage of the optical elements induced by high energy laser

Zhaokai Lou, Kai Han, Minsun Chen, Baozhu Yan, Yi Yang, Hao Liu, Jian Chen, Xiao Li

Proceedings Volume 10847, 108470M (2018) https://doi.org/10.1117/12.2505380

KEYWORDS: Optical components, Optical coatings, Laser energy, Thermal modeling, Mirrors, High power lasers, Laser induced damage

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Proceedings Article | 26 June 2017 Paper

Real-time aberration correction simulation of multimode beam by SPGD algorithm

Qiong Zhou, Wenguang Liu, Baozhu Yan, Quan Sun, Shaojun Du

Proceedings Volume 10335, 103351L (2017) https://doi.org/10.1117/12.2270470

KEYWORDS: Stochastic processes, Distortion, Control systems, Diffraction, Aberration correction, Imaging systems, Computer simulations, Optical simulations, Liquid crystals, Phase measurement, Data corrections, Fiber lasers, Thermal effects, Beam controllers

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Proceedings Article | 26 June 2017 Paper

Ghosting images processing methods for dynamic aberration detection in imaging systems

Yi Yang, Quan Sun, Xuanzhe Zhang, Shaojun Du, Baozhu Yan

Proceedings Volume 10335, 103351Z (2017) https://doi.org/10.1117/12.2270094

KEYWORDS: Imaging systems, Optical components, Stray light, Environmental sensing, Wavefront aberrations, Detection and tracking algorithms, Convolution, Wavefront sensors, Image processing, Digital signal processing

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Proceedings Article | 26 June 2017 Paper

Uncertainty analysis of optical components absorption coefficient measurement using an intra-cavity device

Baozhu Yan, Wenguang Liu, Qiong Zhou, Shaojun Du, Yi Yang

Proceedings Volume 10329, 103294E (2017) https://doi.org/10.1117/12.2270584

KEYWORDS: Reflectivity, Laser irradiation, Absorption, Optical components, Mirrors, Uncertainty analysis, High power lasers, Chemical lasers, Optical coating design

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In order to measure the absorption coefficient and performance degradation characteristics of optical components which used in high power laser system, an intra-cavity device was established based on a discharge-drived CW chemical laser. Two pieces of 45 degree reflecting mirrors were tested. Each mirror was tested for more than twenty times, and high power laser irradiation on the testing mirrors lasted 100 seconds continuously in each test. The dependence of absorption coefficients on irradiation times was acquired. The testing results of both reflecting mirrors showed that, the differences between the experimental absorption coefficients and their fitting curve were up to 30.7% and 21.6% respectively, and the differences were independent of irradiation condition, such as irradiation energy, irradiation power and beam crosssectional area. The uncertainty of absorption coefficient was composed of two parts. For one thing, the uncertainty of the direct measurement results, such as the temperature rise of optical components, can cause the uncertainty of absorption coefficients. This part of uncertainty was about 11.3%. For another, the resonant cavity need to be adjusted again when other optical components were replaced, which lead to the change of the incident angle of the optical components to be measured. A typical film system of 24 layers (12 pairs) was calculated by Thin Film Design Software called TFCalc, which showed the absorption coefficients increased with the increase of incident angle. When the angle of incidence was 0.5 degree from the design value, there would be -60~71ppm difference of absorption coefficient from the original one, and the uncertainty was 14.5%. When there was a deviation of 1 degree, the difference of absorption coefficient and the uncertainty were -112~155ppm and 31.7% respectively. This results showed that, the deviation of incident angle was between 0.5~1 degree in the test. In order to reduce the testing uncertainty of absorption coefficients, the deviation between the incident angle of optical components and the design value should be reduced as much as possible. This provides guidance for measuring the absorption coefficients of optical components with an intra-cavity device.

Proceedings Article | 1 May 2017 Paper

Damage characteristics of the optical element in resonant cavity irradiated by high-power continuous-wave laser

Zhaokai Lou, Kai Han, Rui Song, Baozhu Yan, Zejin Liu

Proceedings Volume 10192, 101920O (2017) https://doi.org/10.1117/12.2261975

KEYWORDS: Continuous wave operation, Mirrors, High power lasers, Optical components, Laser induced damage, Absorption, Laser systems engineering, Laser resonators, Thermal effects, Laser energy, Wave propagation, Fourier transforms, Transmittance, Reflectivity

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Proceedings Article | 12 May 2015 Paper

An intra-cavity device with a discharge-drived CW DF chemical laser

Baozhu Yan, Wenguang Liu, Qiong Zhou, Shengfu Yuan, Qisheng Lu

Proceedings Volume 9513, 95131A (2015) https://doi.org/10.1117/12.2177963

KEYWORDS: Mirrors, Distortion, Absorption, High power lasers, Continuous wave operation, Chemical lasers, Laser systems engineering, Monochromatic aberrations, Calorimetry, Laser scattering

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Proceedings Article | 12 May 2015 Paper

Active mode control of solid state laser using an intra-cavity beam shaper

Wenguang Liu, Qiong Zhou, Baozhu Yan, Zongfu Jiang

Proceedings Volume 9513, 951310 (2015) https://doi.org/10.1117/12.2178595

KEYWORDS: Beam shaping, Resonators, Thermal effects, Solid state lasers, Rod lasers, High power lasers, Laser resonators, Optical simulations, Deformable mirrors, Monochromatic aberrations

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Showing 5 of 8 publications

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