Dr. Fahua Shen Profile

Dr. Fahua Shen

at Yancheng Teachers Univ

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Publications (4)

Proceedings Article | 17 April 2020 Paper

The seed injection Nd: YAG laser frequency stabilization based on the molecular iodine absorption

Zhuang Peng, Chenbo Xie, Fahua Shen, Bangxin Wang, Lu Li, Zhanye Zhang, Yufei Chu, Zhiyuan Fang, Jiadi Shao

Proceedings Volume 11455, 114556C (2020) https://doi.org/10.1117/12.2565262

KEYWORDS: Laser stabilization, Absorption, Iodine, Molecular lasers, Neodymium, YAG lasers, Pulsed laser operation, Ferroelectric materials, Molecules, Doppler effect

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Proceedings Article | 20 February 2018 Paper

Design and simulation of 532nm Rayleigh-Mie Doppler wind Lidar system

Zhuang Peng, Chenbo Xie, Bangxin Wang, Fahua Shen, Min Tan, Lu Li, Zhanye Zhang

Proceedings Volume 10697, 106973W (2018) https://doi.org/10.1117/12.2315493

KEYWORDS: Fabry–Perot interferometers, Doppler effect, LIDAR, Aerosols, Rayleigh scattering, Backscatter, Signal detection, Wind measurement, Transmittance, Mie scattering

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Proceedings Article | 15 November 2017 Paper

The effects of laser beam incident angle and intensity distribution on Fabry-Perot etalon spectrum

Fahua Shen, Yingying Wang, Wenjuan Shi, Ying Chen, Mengling Liu, Wenxin Guo

Proceedings Volume 10605, 106050E (2017) https://doi.org/10.1117/12.2293076

KEYWORDS: Fabry–Perot interferometers, LIDAR

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Fabry-Perot(F-P) etalon has important applications in laser detection, lidar and laser communication systems. In practical applications, the spectrum of the F-P etalon is affected by various factors, such as incident angle, divergence angle, spectral width, intensity distribution of the incident beam, absorption loss, surface defects of the plate and so on. The effects of the incident angle and the beam intensity distribution on F-P etalon spectrum are mainly analyzed. For the first time, taking into account both the beam incident angle and divergence angle, the precise analytical expression of the F-P etalon transmission spectrum is derived. For the Gaussian light intensity distribution, the precise analytical expression of the F-P etalon transmission spectrum is derived. The simulation analysis is carried out and the results are as follows. When the beam divergence angle is not zero, the incident angle increases, on the one hand, the center of the etalon spectrum is moved to the high frequency, and the frequency shift is linear with the square of the incident angle. The slope decreases with the increase of the divergence angle. On the other hand, resulting in peak reduction, spectral line broadening, and with the divergence angle increases, the more obvious the phenomenon. Considering the distribution of Gaussian light intensity, the spectrum of the etalon will be improved with the increase concentration of beam energy. On the one hand, the peak value is increased, the spectral line is narrowed and with the incidence angle increases, the degree of improvement is more obvious. On the one hand, the center of the spectrum moves toward the low frequency, but the larger the incident angle, the smaller the movement amount. The error of frequency discrimination or frequency locking by using the F-P etalon spectrum increases rapidly with the increase of the beam incident angle and beam divergence angle, and the Gaussian light intensity distribution beam can effectively reduce the measurement error.

Proceedings Article | 29 October 2011 Paper

A compact designed receiver for Molecular Doppler lidar

Fahua Shen, Dongsong Sun

Proceedings Volume 8205, 820502 (2011) https://doi.org/10.1117/12.910648

KEYWORDS: Fabry–Perot interferometers, Receivers, Doppler effect, LIDAR, Wind measurement, Optical filters, Aerosols, Sensors, Transmittance, Signal detection

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