Open AccessEnhancement of contrast ratio in chirped pulse amplified laser system by cross-polarized wave generation
Author(s) -
Cheng Liu,
Zhaohua Wang,
Weichang Li,
Liqiang Feng,
Zhiyi Wei
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.7036
Subject(s) - chirped pulse amplification , contrast ratio , optics , laser , nanosecond , picosecond , ultrashort pulse , pulse (music) , contrast (vision) , materials science , physics , optoelectronics , detector
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.