Angular Filtering by Volume Bragg Grating in Photothermorefractive Glass for ns Laser Pulse
The two-dimensional angular filter based on volume Bragg gratings in photothermorefractive glass for ns laser pulse is demonstrated. The experimental results show that the near-field beam quality of laser pulse was effectively improved. The near-field modulation and contrast ratio were improved 1.75 and 4.48 times, respectively. The PSD curves showed that the spatial frequencies more than 0.9mm-1 in x direction and 1.2mm-1 in y direction were effectively suppressed.
Xiong Baoxing,Gao Fan,Zhang Xiang,Yuan Xiao. Angular Filtering by Volume Bragg Grating in Photothermorefractive Glass for ns Laser Pulse[J].Chinese Optics Letters,2019,17(4):04.