Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

被引：29

作者：

Khazanov, Efim ^{[1
]}

机构：

[1] Russian Acad Sci, Gaponov Grekhov Inst Appl Phys, Nizhnii Novgorod 603950, Russia

来源：

HIGH POWER LASER SCIENCE AND ENGINEERING | 2023年 / 11卷

关键词：

self-focusing suppression; space-time overlapping; spatial and temporal self-filtering; symmetric and asymmetric compressors; MULTISTEP PULSE COMPRESSOR;

D O I：

10.1017/hpl.2023.83

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

All space-time coupling effects arising in an asymmetric optical compressor consisting of two non-identical pairs of diffraction gratings are described analytically. In each pair, the gratings are identical and parallel to each other, whereas the distance between the gratings, the groove density and the angle of incidence are different in different pairs. It is shown that the compressor asymmetry does not affect the far-field fluence and on-axis focal intensity. The main distinctive feature of the asymmetric compressor is spatial noise lagging behind or overtaking the main pulse in proportion to the transverse wave vector. This results in a degraded contrast but reduces beam fluence fluctuations at the compressor output. Exact expressions are obtained for the spectrum of fluence fluctuations and fluence root mean square that depends only on one parameter characterizing compressor asymmetry. The efficiency of small-scale self-focusing suppression at subsequent pulse post-compression is estimated.

引用

页数：10

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