受激布里渊散射光限幅输出波形控制研究

数值模拟了种子场诱导受激布里渊散射光限幅过程的限幅输出波形特性.得到利用种子场控制限幅脉冲波形的规律：选取种子场脉冲宽度为抽运脉冲宽度的五倍，抽运脉冲相对于种子脉冲的延迟时间控制在与抽运脉冲宽度相当时，限幅输出波形最佳.限幅输出波形同时受抽运光功率影响，随抽运能量的增加，限幅脉冲功率不断下降，直至趋于0. 关键词： 受激布里渊散射 限幅输出波形 注入种子

Study on the control of optical limiting of pulse-shape in stimulated Brillouin scattering process

Based on the numerical models of stimulated Brillouin scattering(SBS) limiting, the influence of seed pulse duration, induced time and seed power on transmitted pulse shape in SBS optical limiting process is theoretically investigated. By seeding a Stokes pulse into the SBS optical limiting system, the SBS induced by this seeded Stokes pulse can reshape the transmitted limited pulse profile. By choosing suitable physical parameters, the best limited temporal profile can be obtained. The theoretical simulation shows that limited pulse shape can be controlled. When seed pulse duration is chosen as five times the length of the pump pulse duration and the delay time is just the same as the pump pulse duration, the limited pulse shape levels off, and the higher the seed power is, the lower the limited power steps. Optical limiting of pulse-shape can be controlled by introducing a seed to a stimulated Brillouin scattering cell.