Surface-reflection-initiated pulse-contrast degradation in an optical parametric chirped-pulse amplifier

被引：19
作者：
Wang, Jing [1 ,2 ]
Yuan, Peng [1 ,2 ]
Ma, Jingui [3 ]
Wang, Yongzhi [3 ]
Xie, Guoqiang [1 ,2 ]
Qian, Liejia [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Laser Plasmas, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China
[3] Fudan Univ, Dept Opt Sci & Engn, Shanghai 200433, Peoples R China
来源：
OPTICS EXPRESS | 2013年 / 21卷 / 13期
关键词：
TEMPORAL CONTRAST; PUMP-NOISE; AMPLIFICATION; LASER; ENHANCEMENT; GENERATION; OPTIMIZATION; DIFFRACTION;
D O I：
10.1364/OE.21.015580
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study a novel mechanism of pre-pulse generation in an optical parametric chirped-pulse amplification (OPCPA) system through an analytical approach together with numerical simulations. The acquired pre-pulses are initiated from the surface-reflection-induced modulation of the seed spectrum and occur as a consequence of high-order distortion of such modulated spectrum due to the instantaneous gain saturation effect. We demonstrate that the intensities of pre-pulses increase quadratically with the initial temporal modulation-depth of the stretched signal pulse as well as the conversion efficiency prior to substantial pump-depletion. Explicit formulas for estimating the contrast limit due to surface reflections are present. We also discuss the impact of group-velocity mismatch on the pre-pulse generation. The results of this work may deepen our cognition on the complexity of the pulse-contrast problem in OPCPA systems. (C) 2013 Optical Society of America
引用
收藏
页码：15580 / 15594
页数：15
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