抽运光小尺度自聚焦对基于动态波前调控的径向匀滑效果的影响

Influence of Small-Scale Self-Focusing of Pump Laser on Radial Smoothing Effect Based on Dynamic Wavefront Control

基于抽运光非线性小尺度自聚焦效应,分析了光克尔介质类型、抽运光光束质量和光克尔介质长度对束匀滑效果的影响。研究结果表明,在基于动态波前调控的径向匀滑方案中,当抽运光的峰值强度一定时,与CS_2相比,采用硝基苯作为光克尔介质可获得较好的束匀滑效果。在实际应用中,抽运光的小尺度自聚焦效应会随着抽运光峰值强度和光克尔介质长度的增加而加剧,因此需要合理选择抽运光和光克尔介质参数,以获得较好的束匀滑效果,避免抽运光小尺度自聚焦效应的影响。

Based on the nonlinear small-scale self-focusing effect of pump laser,the influences of optical Kerr medium type,pump laser beam quality,and optical Kerr medium length on the beam smoothing effect are analyzed.The research results show that in the radial smoothing scheme based on dynamic wavefront control,an excellent beam smoothing effect is obtained with nitrobenzene instead of CS2 as the optical Kerr medium when the pump laser peak intensity is constant.In the practical applications,since the small-scale self-focusing effect of pump laser is aggravated with the increase of pump laser peak intensity or optical Kerr medium length,it is necessary to select suitable parameters of pump laser and optical Kerr medium for a good beam smoothing effect.Thus the influence of small-scale self-focusing effect of pump laser can be avoided.