17 September 2013 Influence of BBO temperature distribution on phase mismatching distribution in fourth harmonic
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Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 890414 (2013) https://doi.org/10.1117/12.2034339
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China
Abstract
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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Chao Wang, Chao Wang, Miao Yu, Miao Yu, Xin-yu Chen, Xin-yu Chen, Xue-chun Tan, Xue-chun Tan, Yong-ji Yu, Yong-ji Yu, Guang-yong Jin, Guang-yong Jin, Chun-ming Wan, Chun-ming Wan, "Influence of BBO temperature distribution on phase mismatching distribution in fourth harmonic", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 890414 (17 September 2013); doi: 10.1117/12.2034339; https://doi.org/10.1117/12.2034339
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