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题名	超短超强激光单次脉冲的信噪比测量技术研究
作者	石帅旭
学位类别	硕士
答辩日期	2016
授予单位	中国科学院上海光学精密机械研究所
导师	朱健强
关键词	超短超强激光 单次脉冲 信噪比测量 谐振腔振荡
其他题名	Contrast Measurement Techniques for Single-shot Ultra-short and Ultral-intense Laser Pulse
中文摘要	超短超强激光装置的聚焦峰值功率已经达到1022 W/cm2，未来将可能发展到1025 W/cm2，为人类进行极端物理实验提供了可能，随着激光强度的提高，激光系统对信噪比的要求也随之增加，需达到1010甚至更高，这对信噪比测量（特别是单次脉冲信噪比测量）技术提出了极大的挑战。 针对目前超短超强激光单次脉冲信噪比测量的发展现状和技术需求，本文提出了谐振腔振荡式单次脉冲信噪比测量技术。该技术以三阶强度互相关理论为基础，利用谐振腔脉冲复制器，实现单个脉冲的复制，得到等比例强度衰减的基频被测脉冲序列和倍频扫描脉冲序列，在脉冲序列中不同脉冲对之间引入不同的时间延迟，从而实现对单次脉冲的扫描测量。同时谐振腔技术，将本不可被光电器件分辨的超短脉冲信号，延展为可分辨的信号，可以采用PMT直接进行测量。 本文对谐振腔振荡式单次脉冲信噪比测量技术进行了详细的理论分析，分析表明该技术可实现1010甚至更高信噪比的动态范围，获得50ps甚至更大的时间窗口，达到百飞秒的高时间分辨率，而且采用全口径光束测量，保证了测量信号的高保真度，谐振腔结构的稳定性也可以保证。另外，分析了色散、次脉冲等因素可能引入的误差，采取了相应措施消除影响。
英文摘要	The focused peak power of the developed ultral-shot and ultral-intense laser system has reached 1022W/cm2, and will be 1025W/cm2 in the future, which provide humans a possibility for many extreme physical experiments. As the laser intensity being higher and higher, the contrast of the laser has to be more than 1010 or much higher. This a great challenge for the contrast measurement, especially for the single-shot contrast measurement. For the requirement of the contrast measurement of ultral-shot and ultral-intense laser system, a new cross-correlator structure based on resonator oscillation is proposed for contrast measurement of single-shot femtosecond pulse. Based on the theory of third order cross-correlation, using the replicator of resonator oscillation to replicate the single shot pulse, we get the sequences of fundamental frequency to be test and scanning second harmonic frequency attenuated at equal ratio. We set different time delay between every pair of pulses which include one fundamental frequency pulse and one second harmonic frequency pulse, and then the scanning measurement can be realized. Meanwhile, with the technique of resonator oscillation, the short signal which could not be distinguished will be extended to a sequence of signal which can be distinguished directly by the PMT. Analysis is taken on the resonator for its functions which indicates that high dynamic range >1010 (can be extended higher), time window as 50ps (can be extended larger) and high temporal resolution as about 100fs can be realized in this construction. Moreover, high fidelity is achieved since the pulse is measured with full aperture and the stability also can be guaranteed. Further, errors of the dispersion or minor pulses are also analyzed and avoided by some methods.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16999]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	石帅旭. 超短超强激光单次脉冲的信噪比测量技术研究[D]. 中国科学院上海光学精密机械研究所. 2016.

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