Theory of small-scale self-focusing of spatially partially coherent beams and its implications for high-power laser systems

被引：0
作者：
Wang, Ruifeng [1 ,2 ]
Zhang, Xiaoqi [1 ]
Zhang, Yanli [1 ]
Yang, Fanglun [1 ]
Tang, Jianhao [1 ]
Chen, Ziang [1 ,2 ]
Zhu, Jianqiang [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab High Power Laser & Phys, Shanghai 201800, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing, Peoples R China
来源：
HIGH POWER LASER SCIENCE AND ENGINEERING | 2024年 / 12卷
关键词：
B-integral; complex screen method; nonlinearity; small-scale self-focusing; spatially partially coherent beams; NONLINEAR MEDIA; LIGHT-BEAMS; GLASS LASER; PROPAGATION; DIFFRACTION; BREAKUP; PULSE;
D O I：
10.1017/hpl.2024.12
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Based on the paraxial wave equation, this study extends the theory of small-scale self-focusing (SSSF) from coherent beams to spatially partially coherent beams (PCBs) and derives a general theoretical equation that reveals the underlying physics of the reduction in the B-integral of spatially PCBs. From the analysis of the simulations, the formula for the modulational instability (MI) gain coefficient of the SSSF of spatially PCBs is obtained by introducing a decrease factor into the formula of the MI gain coefficient of the SSSF of coherent beams. This decrease can be equated to a drop in the injected light intensity or an increase in the critical power. According to this formula, the reference value of the spatial coherence of spatially PCBs is given, offering guidance to overcome the output power limitation of the high-power laser driver due to SSSF.
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页数：6
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