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Influences of optical breakdown on stimulated Brillouin scattering

Lü Zhi-Wei He Wei-Ming Li Qiang Ba De-Xin Hasi Wu-Li-Ji

Influences of optical breakdown on stimulated Brillouin scattering

Lü Zhi-Wei, He Wei-Ming, Li Qiang, Ba De-Xin, Hasi Wu-Li-Ji
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  • Received Date:  15 March 2005
  • Accepted Date:  15 June 2005
  • Published Online:  20 December 2005

Influences of optical breakdown on stimulated Brillouin scattering

  • 1. (1)哈尔滨工业大学光电子技术研究所,哈尔滨 150001; (2)哈尔滨工业大学光电子技术研究所,哈尔滨 150001;内蒙古民族大学化学学院,通辽 028043

Abstract: Avalanche ionization model is introduced to the coupled stimulated Brillouin scattering (SBS) equations. Numerical simulation of SBS energy reflectivity as a function of pump intensity is made with and without the optical breakdown factor in the equations. In the experiment, purified and unpurified CCl4 media are studied with an Nd:YAG laser system with Q switch, the results are found to agree well with the numerical solutions. It is observed that under conditions that the optical breakdown does not occur, the energy reflectivity increases nonlinearly with pump intensity until reaching a certain value above which it tends to grow slowly. In cases with the breakdown, the energy reflectivity first increases nonlinearly with the pump intensity to a peak value and then decreases dramatically as optical breakdown occurs. The stability of energy reflectivity in the cases without optical breakdown is obviously better than cases otherwise.

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