Prof. Xiaoquan Sun Profile

Prof. Xiaoquan Sun

at Electronic Engineering Institute

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Author

Publications (9)

Proceedings Article | 18 December 2019 Paper

Summarize the damage caused by different types of laser beams

Tianyu Wang, Jintian Bian, Xiaoquan Sun

Proceedings Volume 11333, 113330S (2019) https://doi.org/10.1117/12.2543888

KEYWORDS: Ultraviolet radiation, Crystals, Pulsed laser operation, Laser induced damage, Electrons, Laser damage threshold, Laser crystals, Light sources and illumination, Femtosecond phenomena

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Proceedings Article | 25 October 2016 Paper

The study on the generation method of two-dimensional airy beams based on digital blazed grating

Yun-long Wu, Jin-song Nie, Li Shao, Xiao-quan Sun

Proceedings Volume 9686, 96860T (2016) https://doi.org/10.1117/12.2243245

KEYWORDS: Diffraction, Diffraction gratings, Gaussian beams, Modulation, Phase shift keying, Bessel beams, Wave propagation, Optoelectronics, Beam propagation method, Fourier transforms

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Proceedings Article | 19 October 2016 Paper

The study on measurement methods of phase modulation characteristics for universal liquid crystal spatial light modulator

Yun-long Wu, Jin-song Nie, Li Shao, Xiao-quan Sun

Proceedings Volume 10155, 101552G (2016) https://doi.org/10.1117/12.2247016

KEYWORDS: Phase modulation, Liquid crystals, Phase measurement

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The universal liquid crystal spatial light modulator (LC-SLM) was widely used in many aspects of optical study. The working principles and application of LC-SLM were introduced briefly. The traditional Twyman-Green interference method which was used to measure the phase modulation characteristics of universal liquid spatial light modulator had some obvious disadvantages in the practical use, such as high environmental requirement and difficult interference fringes acquisition. The disadvantages of traditional Twyman-Green interference method gained the difficulty of carrying out corresponding optical measurement experiments. To avoid this, the traditional Twyman-Green interference method was improved in the paper. The experimental light path was designed anew. Distinct and stable interference fringes could be acquired by controlling the optical path difference (OPD) dynamically. To verify the validity of the newly proposed measurement method, the phase modulation characteristics of P512-1064 LC-SLM produced by Meadowlark Company were measured by utilizing the improved Twyman-Green interference method at the wavelength of 632.8 nm which was beyond the working wavelengths of the LC-SLM. A series of gray images covering the gray degree from 1 to 256 which were generated by computer were used in the experiment. An extra lens was added in front of a reflector in the optical path to control the OPD dynamically. 256 interference images were acquired after loading the gray image into the LC-SLM in order. After that, the acquired interference images should be pre-processed by several digital image processing methods for easier measurement later. Specifically, the method of gray filtering and morphological processing were adopted to make the interference fringes clearer and thinner in the corresponding processing. Then, the phase modulation curve of the LC-SLM was acquired through numerical computation of the cycles of the interference fringes. In general, the phase modulation curve we acquired was not so accurate in the practical use, as the LC-SLM was required to work from zero to 2pi in the linear interval. So, the nonlinear interval among the phase modulation curve should be compensated and corrected. Here, the method of inverse interpolation which was regarded as one of the most common phase correcting methods was utilized. The corrected phase modulation curve was acquired after numerical computation. The results shows that the improved Twyman-Green interference method could realize the dynamic control of the interference fringes. As a result, the method's requirement for external experiment environment was reduced and its feasibility was improved. Also, the Root Mean Squared Error (RMSE) between the calibrated phase modulation curve and the ideal phase modulation curve was reduced.

Proceedings Article | 11 November 2010 Paper

Fuzzy synthetic evaluation method for laser jamming to CCD imaging performance

Yin Xu, Xiao-quan Sun, Li Shao

Proceedings Volume 7850, 78501V (2010) https://doi.org/10.1117/12.870248

KEYWORDS: Charge-coupled devices, Signal to noise ratio, Laser applications, Fuzzy logic, Pulsed laser operation, Information security, Imaging systems, Sensors, Laser scattering, Sun

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Proceedings Article | 11 November 2010 Paper

Simulation of laser jamming and its influence on CCD imaging performance

Yin Xu, Xiao-quan Sun, Li Shao

Proceedings Volume 7850, 78501W (2010) https://doi.org/10.1117/12.870252

KEYWORDS: Charge-coupled devices, Optical simulations, CCD image sensors, Point spread functions, Image processing, Pulsed laser operation, Analytical research, Sensors, Laser applications, Device simulation

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Proceedings Article | 9 November 2010 Paper

Laser stealth method of optical system

Xian-an Dou, Xiao-quan Sun, Li Shao

Proceedings Volume 7853, 78532M (2010) https://doi.org/10.1117/12.870106

KEYWORDS: Laser optics, Reconnaissance, Active optics, Laser applications, Geometrical optics, Mirrors, Pulsed laser operation, Optical simulations, Optical authentication, Electro optical modeling

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Proceedings Article | 22 October 2010 Paper

Method for laser disturbing image quality evaluation based on wavelet weight and correlation

Yin Xu, Xiao-quan Sun, Zuo-lai Wang

Proceedings Volume 7658, 765837 (2010) https://doi.org/10.1117/12.865354

KEYWORDS: Wavelets, Image quality, Visualization, Image processing, Charge-coupled devices, Spatial frequencies, Image analysis, Laser applications, Human vision and color perception, Wavelet transforms

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Proceedings Article | 20 November 2009 Paper

An inversion of plume gas concentration distribution based on multivariate regression analysis

Qing Ye, Xiaoquan Sun, Li Shao, Yafu Wang

Proceedings Volume 7511, 75110L (2009) https://doi.org/10.1117/12.837910

KEYWORDS: Absorption, Infrared radiation, Data modeling, Spectroscopic atmospheric monitoring techniques, Signal attenuation, Atmospheric modeling, Spectroscopy, Databases, Transmittance, Gases

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Proceedings Article | 7 August 1998 Paper

Q-switching and tuning of flashlamp-pumped Ti:sapphire laser with electro-optic crystal

Xiaoquan Sun, Xingwang Chen, Ziyao Li, Shaotang Yin, Lusheng Wu, Jianping Xie

Proceedings Volume 3549, (1998) https://doi.org/10.1117/12.344106

KEYWORDS: Crystals, Q switches, Electro optics, Sapphire lasers, Laser crystals, Wave plates, Quartz, Mirrors, Transmittance, Polarizers

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