Dependence of the focal intensity of a femtosecond laser pulse on the non-flatness of compressor diffraction gratings  

作　　者：Efim Khazanov 

机构地区：[1]Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences,Niznij Novgorod,Russia

出　　处：《High Power Laser Science and Engineering》2024年第6期144-155,共12页高功率激光科学与工程(英文版)

基　　金：supported by the Ministry of Science and Higher Education of the Russian Federation(075-15-2022-316,Center of Excellence‘Center of Photonics’)

摘　　要：An analytical expression for the focal intensity of a laser pulse was obtained for an asymmetric out-of-plane compressor with gratings of arbitrary surface shape. The focal intensity is most strongly affected by the linear angular chirp caused by the spatial shift of different frequencies on the second and third gratings. The chirp can be eliminated by simply rotating the fourth grating by an optimal angle, which significantly reduces the requirements for the grating quality. It is shown that the decrease in the focal intensity depends on the product of the grating surface root mean square and pulse spectrum bandwidth. With low-quality gratings, spectrum narrowing would not reduce focal intensity;contrariwise, it may even slightly increase it.

关 键 词：four-grating compressor grating surface profile petawatt lasers space-time coupling 

分 类 号：TN248[电子电信—物理电子学]