Open AccessInvestigation on the influences of linear chirp with different input pulse intensities on BaF2 cross-polarized wave generation
Author(s) -
Gang Li,
Hongjie Liu,
Feng Liu,
Wen Xian-Lun,
He Ying-Ling,
Faqiang Zhang,
Zenghai Dai
Publication year - 2015
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.64.020602
Subject(s) - chirp , femtosecond , pulse (music) , optics , chirp spread spectrum , physics , laser , femtosecond pulse shaping , materials science , telecommunications , computer science , detector , channel (broadcasting) , spread spectrum , direct sequence spread spectrum
Cross-polarized wave (XPW) generation based on BaF2 crystal is one of the most important tools in improving the contrast of ultra-intense femtosecond laser pulses at present. In this paper, the influences of linear chirp with different input pulse intensities on BaF2 XPW generation, including conversion efficiency, spectrum broadening, and pulse duration reduction are in detail simulated and discussed. Especially, the influence of linear chirp on spectrum broadening is comparatively investigated under unsaturated and intense input pulses. While the amount of spectrum broadening relative to linear chirp is symmetrical with respect to the zero chirp point under unsaturated input pulse, the results show that it is no longer those in the case under intense input pulse, and the intrinsic reason is explained in detail in this paper.