摘要
Spatial intensity modulation in amplified laser beams,particularly hot spots,critically constrains attainable pulse peak power due to the damage threshold limitations of four-grating compressors.This study demonstrates that the double-smoothing grating compressor(DSGC)configuration effectively suppresses modulation through directional beam smoothing.Our systematic investigation validated the double-smoothing effect through numerical simulations and experimental measurements,with comprehensive spatiotemporal analysis revealing excellent agreement between numerical and practical pulse characteristics.Crucially,the DSGC enables a 1.74 times energy output boost compared to conventional compressors.These findings establish the DSGC as a pivotal advancement for next-generation ultrahighpower laser systems,providing a viable pathway toward hundreds of PW output through optimized spatial energy redistribution.
基金
supported by the Shanghai Municipal Natural Science Foundation(Grant No.20ZR1464500)
the National Natural Science Foundation of China(NSFC)(Grant Nos.61905257 and U1930115)
the Shanghai Municipal Science and Technology Major Project(Grant No.2017SHZDZX02)
the Ministry of Science and Higher Education of the Russian Federation(Project No.FFUF-2024-0038)。
