Linear propagation performance in high power laser facility
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摘要: 在菲涅耳数的基础上重新定义了衍射特征量，并将其定义扩展至聚焦或发散光路，定义了一个光学系统中各光学元件衍射特征量的符号。通过全新的定义和扩展，研究了波前畸变对近场调制度的影响以及正弦调频光谱色散平滑光束衍射传输引入的幅频调制的大小。以神光-Ⅲ主机主放大级为例，研究了元件波前畸变对近场调制度的影响以及正弦调频光谱色散平滑光束衍射传输引入的幅频调制的大小。衍射特征量与能流分布F相结合，可以作为评价高功率激光装置线性传输效应的一项受限指标，指导高功率激光装置的设计。Abstract: The diffraction character is redefined based on Fresnel number. This new definition is extended to focusing or diffusing optical path. The sign of the new diffraction character is defined for each optical element in a laser system. According to these definitions and extending, the effect of phase aberration on near-field modulation and the effect of linear diffraction on FM-to-AM are studied. The linear diffraction effect on high power laser facility can be evaluated by the combination of the new diffraction character and the energy fluence.
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Key words:
- diffraction /
- Fresnel number /
- linear propagation /
- smoothing by spectral dispersion /
- FM-to-AM effect
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