高功率激光驱动器中小尺度自聚焦和噪声模型
Model of smallscale selffocusing and noise in high power laser driver
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摘要: 建立了一套线性的近似分析方法,研究高功率激光驱动器中强激光传输的小尺度自聚焦效应和相位噪声对光束传输和光束质量的影响,给出了系统噪声强度、B积分值与光束近场调制对比度之间的定量关系。研究表明,为保证输出光束质量,即近场调制对比度小于给定值,系统内的噪声强度必须符合一定的谱分布。Abstract: The nonlinear laser beam propagation in high power laser driver and the influence of the smallscale selffocusing and phase noise on beam quality in disk amplifier have been analyzed by a linear model. The quantitative relations between intensities of phase noise, Bintegral, and the beam intensity contrast in near field are given explicitly. A spectrum specification of phase noise can be given when modulation contrast of output beam is very small.
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Key words:
- smallscale selffocusing /
- beam quality /
- phase noise /
- modulation contrast /
- bintegral
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