Dr. Chao Wang Profile

Dr. Chao Wang

at Changchun Univ of Science and Technology

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Author

Publications (4)

SPIE Journal Paper | 3 August 2016

Optical multiaccess free-space laser communication system

Lun Jiang, Li-Zhong Zhang, Chao Wang, Yan An, Yuan Hu

OE, Vol. 55, Issue 08, 086102, (August 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.8.086102

KEYWORDS: Prisms, Telecommunications, Laser communications, Beam expanders, Free space optical communications, Free space optics, Laser systems engineering, Optical antennas, Laser optics, Satellites

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Proceedings Article | 26 January 2016 Paper

The detection capability of space-based combined system for space debris

Chao Wang, Yalin Zhang, Qiang Fu, Juntong Zhan, Long Han

Proceedings Volume 9796, 97962K (2016) https://doi.org/10.1117/12.2234180

KEYWORDS: Imaging systems, Telecommunications, Ranging, Target detection, Laser communications, Spatial resolution, Sensors, Diffraction, Image resolution, Space operations

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SPIE Journal Paper | 2 December 2013

High-repetition-rate tunable mid-infrared optical parametric oscillator based on MgO: periodically poled lithium niobate

Yongji Yu, Xinyu Chen, Jing Zhao, Chao Wang, Chunting Wu, Guangyong Jin

OE, Vol. 53, Issue 06, 061604, (December 2013) https://doi.org/10.1117/12.10.1117/1.OE.53.6.061604

KEYWORDS: Optical parametric oscillators, Crystals, Mid-IR, Neodymium, Lithium niobate, Q switched lasers, Q switching, Mirrors, Electro optics, Reflectivity

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Proceedings Article | 17 September 2013 Paper

Influence of BBO temperature distribution on phase mismatching distribution in fourth harmonic

Chao Wang, Miao Yu, Xin-yu Chen, Xue-chun Tan, Yong-ji Yu, Guang-yong Jin, Chun-ming Wan

Proceedings Volume 8904, 890414 (2013) https://doi.org/10.1117/12.2034339

KEYWORDS: Crystals, Laser crystals, Nonlinear crystals, Second-harmonic generation, High power lasers, 3D modeling, Temperature metrology, Ultraviolet radiation, Mathematical modeling, Thermal modeling

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266nm UV laser has a wide range of applications in various fields by its advantages in high single photon energy and high resolution, which also has a development gradually moving in the direction of high power and high conversion efficiency. In the process of high-power laser frequency doubling, BBO crystal inevitably absorbs part of fundamental light power and frequency doubled light power, it induced the temperature rise along the direction of radiation in crystal and destroyed the phase-matching conditions of BBO crystal that lead to phase mismatching. In order to improve harmonic conversion efficiency as well as reduce the influence of output power and beam quality caused by phase mismatching, in this paper we analyzed the process of phase mismatching, established the thermal-induced phase mismatching model by using analytical expression of the nonlinear crystal temperature field equation which has been given, and the three-dimensional phase mismatching distribution were obtained. There are three major contributions in the paper. Firstly, the working process of the nonlinear crystal was analyzed, and the physical and mathematical models of temperature distributions were established, and the BBO crystal three-dimensional temperature distributions were also obtained. Secondly, a variety of factors that affect the temperature distributions within the BBO crystal were summarized. For different 532nm waist radius and 532nm input power, they were numerical simulated use of MATLAB. Finally, combined with the above analysis, the physical and mathematical models of phase mismatching caused by energy absorption of BBO in forth harmonics generation were established, the phase mismatching distributions in the crystal were simulated as well, especially the changes to phase mismatching distributions with different parameter were analyzed. Combination of the multiplier theory, the influence of phase mismatching on frequency doubling conversion efficiency was analyzed. The results indicate that the physical model which established in this paper can explain the physical reasons in high-power laser frequency doubling system very well, such as the reduce in conversion efficiency and output power and beam quality. All research results play instructive effect at the improvement of conversion efficiency and the compensation for the phase mismatching for further research.

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