多纵模受激布里渊散射阈值

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. 关键词： 受激布里渊散射 多纵模 阈值

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

On the basis of the multi-longitude theory of stimulated Brillouin scattering (S BS), a group of coupling wave equations without limitation to the mode separatio n of a laser was deduced while the random initial phases of the multi-longitudin al modes were introduced for SBS pumped by a free-operating laser. The dependenc es of broadband SBS threshold on the bandwidth of the laser, the number of the l aser modes, the mode separation of the laser, the linewidth of Brillouin, and th e ratio of the SBS interaction length to the laser coherence length were discuss ed in detail. And the theoretical results were consistent with the experimental results reported.