光纤光栅在高功率连续光纤激光器中的发展及展望

目前光纤光栅在高功率连续光纤激光器中的应用主要有两个方面，一是作为谐振腔腔镜，二是用来抑制激光器的非线性效应。首先论述了光纤光栅作为腔镜技术的发展现状，然后着重论述了能够抑制光纤激光器中非线性效应的特殊光纤光栅的发展状况。并详细描述了倾斜布拉格光纤光栅抑制受激拉曼散射和受激布里渊散射、长周期光纤光栅抑制受激拉曼散射以及相移长周期光纤光栅抑制自相位调制或四波混频等非线性效应引起的光谱展宽的研究进展。最后展望了光纤光栅在高功率光纤激光器领域的发展趋势，认为光纤光栅将朝着更高承载功率与长波长方向发展，同时认为基于飞秒激光刻写的光纤光栅技术、能够同时抑制多种非线性效应的光纤光栅技术、以及基于光纤光栅的光纤激光器激光偏振控制技术等将成为新的研究热点。

Development and prospect of fiber grating in high-power continuous fiber laser

At present, the applications of fiber gratings in high-power fiber lasers mainly include two aspects, be used as cavity mirrors and to suppress nonlinear effects. The development of fiber gratings as cavity mirror was discussed firstly, and then the applications of special structure fiber gratings with nonlinear effects suppression function was focused on. The stimulated Raman scattering and stimulated Brillouin scattering suppression method were introduced based on tilted fiber Bragg grating in detail. And the feasibility of suppressing stimulated Raman scattering by long-period fiber grating was also discussed. Further, a novel method of suppressing self-phase modulation or four-wave mixing by utilizing phase-shifted long-period fiber grating was presented. Finally, a prospect of the applications of fiber gratings in high-power fiber laser was provided. Higher power durability and longer wavelength were the definite development directions. And also considered that the femtosecond laser lithography technology, cascaded fiber grating that can suppress multiple nonlinear effects, and polarization control technology based on special structure fiber gratings will become a new research hotspot.