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

页码：15580 / 15594

页数：15

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