用于高动态范围单次激发时间对比度测量的时间对比度降低技术
Temporal contrast reduction techniques for high dynamic-range single-shot temporal contrast measurement
摘要：
拍瓦级高动态范围激光脉冲时间对比度的单次测量，不仅对改善拍瓦级激光装置本身的条件有重要意义，而且对各种高强度激光物理实验也有重要意义，至今仍是一个难题。在这项研究中，提出了一个新的想法，提高动态范围的单次拍摄的时间对比度测量，使用新的时间对比度降低技术。应用单级脉冲拉伸、抗饱和吸收或光学克尔效应的原理验证实验成功地将时间对比度降低了大约一个数量级。结合SRSI-ETE方法，其动态范围表征能力提高了约一个数量级，达到约109。预期可以使用级联的时间对比度降低过程来表征更高的动态范围时间对比度。
英文摘要：
A single-shot characterization of the temporal contrast of a petawatt laser pulse with a high dynamic-range, is important not only for improving conditions of the petawatt laser facility itself, but also for various high-intensity laser physics experiments, which is still a difficult problem. In this study, a new idea for improving the dynamic-range of a single-shot temporal contrast measurement using novel temporal contrast reduction techniques is proposed. The proof-of-principle experiments applying single stage of pulse stretching, anti-saturated absorption, or optical Kerr effect successfully reduce the temporal contrast by approximately one order of magnitude. Combining with the SRSI-ETE method, its dynamic-range characterization capability is improved by approximately one order of magnitude to approximately 109. It is expected that a higher dynamic-range temporal contrast can be characterized using cascaded temporal contrast reduction processes.
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