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Enhancement of contrast ratio in chirped pulse amplified laser system by cross-polarized wave generation

Liu Cheng Wang Zhao-Hua Li Wei-Chang Liu Feng Wei Zhi-Yi

Enhancement of contrast ratio in chirped pulse amplified laser system by cross-polarized wave generation

Liu Cheng, Wang Zhao-Hua, Li Wei-Chang, Liu Feng, Wei Zhi-Yi
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Publishing process
  • Received Date:  22 April 2010
  • Accepted Date:  10 May 2010
  • Published Online:  05 May 2010

Enhancement of contrast ratio in chirped pulse amplified laser system by cross-polarized wave generation

  • 1. (1)Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;(2)Department of Applied Physics, National University of Defense Technology, Changsha 410073, China

Abstract: This paper reports our experimental research on the laser contrast ratio enhancement in the XL-Ⅲ (eXtreme Light Ⅲ) facility with the technology of cross-polarized wave (XPW) generation. Based on the theoretical analysis of the relerant principles, we introduced an XPW filter in the facility, which was upgraded with a double chirped pulse amplification (DCPA) scheme. Under optimized system design and alignment, we measured the conversion efficiency from fundamental wave to cross-polarized wave to be higher than 10%. The pre-pulses in nanosecond scale were deeply suppressed and the contrast ratio in picosecond scale was enhanced from 10-5 to 10-7. Our results show the XPW generation provides an effective technique to improve the contrast ratio of a Chirped-pulse amplification laser system, which is a key issue in ultrahigh intensity laser-matter researches.

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