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Research on the influence of impurity particles on the optical breakdown threshold value of stimulated Brillouin scattering medium

Hasi Wu-Li-Ji Wang Xue-Yang Guo Xiang-Yu Zhong Zhao-Ming Fan Rui-Qing Lin Dian-Yang He Wei-Ming Lü Zhi-Wei

Research on the influence of impurity particles on the optical breakdown threshold value of stimulated Brillouin scattering medium

Hasi Wu-Li-Ji, Wang Xue-Yang, Guo Xiang-Yu, Zhong Zhao-Ming, Fan Rui-Qing, Lin Dian-Yang, He Wei-Ming, Lü Zhi-Wei
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  • Received Date:  08 November 2011
  • Accepted Date:  21 December 2011
  • Published Online:  05 July 2012

Research on the influence of impurity particles on the optical breakdown threshold value of stimulated Brillouin scattering medium

  • 1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 61138005, 21071035), the Program for New Century Excellent Talents in University, China (Grant No. NCET-08-0173) and the Fundamental Research Funds for Central Universities, China (Grant No. HIT.BRET2.20100/2).

Abstract: In this paper, we establish the physical model of hot damage to the stimulated Brillouin scattering (SBS) medium, and with numerical simulation method the curve of the temperature of impurity particles versus the radius is investigated. The result indicates that impurity particle has a maximal thermal effect radius and when the sizes of particles contained in the medium are near the radius, the optical breakdown phenomenon is most likely to appear, and at this point the optical breakdown threshold is lowest. We use FC-3283, GF-180 and HFE-7100 as the SBS medium in Continuum Nd: YAG laser system. The SBS medium passes through the filter with different diameters. We study the optical breakdown thresholds and energy reflectivities before and after filtration. It is demonstrated that with the filter diameter decreasing, the optical breakdown threshold increases gradually and the energy reflectivity is significantly improved through filter. In addition, a method of using He-Ne laser transmission light spot size to judge whether optical breakdown phenomenon happens, is also developed. This method is convenient and accurate, and can effectively reduce the error caused by naked eye observation.

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