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Proceedings Paper

Diagnostics of pulse contrast for petawatt laser in SGII
Author(s): Xiaoping Ouyang; Daizhong Liu; Baoqiang Zhu; Jian Zhu; Jianqiang Zhu
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Paper Abstract

Pulse contrast is an important parameter for ultrafast pulses. It shall be 108 or higher in order to avoid effect from noise before main pulse. Diagnostics with cross-correlation can achieve high temporal resolution such as ~7fs. Cross-correlation has advantage in pulse contrast measurement than autocorrelation because it can distinguish noise before or after main pulse. High dynamic range is also essential in pulse contrast measurement. Cross-correlation signal from a single shot is converted into a signal series through fiber array, which can be analyzed by a set of a PMT and an oscilloscope. Noise from nonlinear crystal and scatter needs decrease to improve dynamic range. And pulse power is also discussed in pulse contrast experiments. Time delay τ is generated by travel stage in measurement for repetition pulses. Then energy instability will generate error in this measurement. In measurement for single shot pulse, time delay τ is generated by slant angle of beams. The scanning procession is completed with thousands parts of beam section within a single shot, and error will generated from no uniformity in near field. Performance test of pulse contrast measurement is introduced in subsequent sections. Temporal resolution is testified by self-calibration. Dynamic range is judged by a parallel flat. At last pulse contrast of petawatt laser is diagnosed by a single shot cross-correlator with high confidence. The ratio is 10-6 at 50ps before main pulse, and 10-4 at 10ps before main pulse.

Paper Details

Date Published: 26 February 2015
PDF: 7 pages
Proc. SPIE 9345, High Power Lasers for Fusion Research III, 93450R (26 February 2015); doi: 10.1117/12.2178692
Show Author Affiliations
Xiaoping Ouyang, Shanghai Institute of Optics and Fine Mechanics (China)
Daizhong Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Baoqiang Zhu, Shanghai Institute of Optics and Fine Mechanics (China)
Jian Zhu, Shanghai Institute of Laser Plasma (China)
Jianqiang Zhu, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 9345:
High Power Lasers for Fusion Research III
Abdul A. S. Awwal; Monya A. Lane, Editor(s)

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