Design of photonic-crystal pulse-compression grating for high-energy chirped laser

The low threshold of compression gratings determines the maximum output energy of high-energy PW laser systems. For the compressor in the Xingguang-Ⅲ facility which is under development, this paper designed a 2-D photonic-crystal grating of fused silica which utilizes photonic crystal technology and the grating’s micro-structure. The results show that the diffraction efficiency of the minus first order of the grating exceeds 92% for incident angle from 57° to 77° when the incident wavelength is 1 053 nm, and for wavelength from 1 040 nm to 1 090 nm when the incident angle is 71°. The grating meets the requirements of wide spectral range (50 nm) and wide range of angle of incidence (18°).