期刊
HIGH POWER LASER SCIENCE AND ENGINEERING
卷 10, 期 -, 页码 -出版社
CHINESE LASER PRESS & CAMBRIDGE UNIV PRESS
DOI: 10.1017/hpl.2022.18
关键词
chirped-pulse amplification laser; stretcher; temporal contrast
类别
资金
- Euratom Research and Training Programme [633053]
In this study, we propose and experimentally verify a model that explains the combined influence of beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher. By comparing experimental results with an analytical model, we find that different beam sizes have different effects on the temporal contrast.
In this work, we propose and verify experimentally a model that describes the concomitant influence of the beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher in chirped-pulse amplification laser systems. We develop an analytical model that is capable of predicting the rising edge caused by the reflection from an optical element in a pulse stretcher, based on the power spectral density of the surface and the spatial beam profile on the surface. In an experimental campaign, we characterize the temporal contrast of a laser pulse that passed through either a folded or an unfolded stretcher design and compare these results with the analytical model. By varying the beam size for both setups, we verify that optical elements in the near- and the far-field act opposed to each with respect to the temporal contrast and that the rising edge caused by a surface benefits from a larger spatial beam size on that surface.
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