Cut-off of SRRS Growth in high-power lasers via Transmission Volume Bragg Gratings

We propose a method for the cut-off of stimulated rotational Raman scattering (SRRS) in high-power lasers after long-distance propagation via a transmission volume Bragg grating (VBG).The VBG with both spectral and angular selectivity was designed, and its application as a near-field spatial filter for SRRS cut-off was analyzed.The results show that the spectral selectivity of the VBG enables effective separation of pump light and Stokes light in the near field, and also improves the beam quality by filtering out highfrequency components of the pump light.This method can provide a novel and effective approach for suppressing nonlinear effects and controlling the beam quality of high-power lasers.