多纵模受激布里渊散射阈值

Threshold of stimulated Brillouin scattering pumped by a multi-longitudinal mode laser

针对自由运转激光,通过在多纵模受激布里渊散射理论中引进不同纵模的随机初始相位,推导出抽运光模间隔不受任何限制的宽带多纵模SBS耦合波方程,讨论了宽带SBS阈值与抽运光线宽、模数、模间隔、布里渊线宽及有效相互作用长度之间的关系.理论与已有实验结果符合得很好.

On the basis of the multi-longitude theory of stimulated Brillouin scattering （SBS）, a group of coupling wave equations without limitation to the mode separation of a laser was deduced while the random initial phases of the multi-longitudinal modes were introduced for SBS pumped by a free-operating laser. The dependences of broadband SBS threshold on the bandwidth of the laser, the number of the laser modes, the mode separation of the laser, the linewidth of Brillouin, and the ratio of the SBS interaction length to the laser coherence length were discussed in detail. And the theoretical results were consistent with the experimental results reported.