摘要
光参量啁啾脉冲放大(OPCPA)在饱和放大区存在一个增益稳定点,据此设计了一个输出稳定的三级OPCPA系统;第一、二、三级分别选用准相位匹配的周期极化钛氧磷酸钾(PPKTP)晶体、LBO晶体和KDP晶体作为增益介质。饱和放大时,增益随泵浦光强度变化时的增益输出稳定性明显改善,在泵浦光强度抖动低于6%的情况下,各级光参量放大器OPA输出的增益抖动小于1%。前级采用准相位匹配的PPKTP晶体作为增益介质,在远低于破坏阈值的30MW/cm2的泵浦功率密度下,可得到2×105的饱和放大增益和20%的能量转换效率。
A laser system with high output stability was designed for three-stage optical parametric chirped-pulse amplification (OPCPA). The PPKTP crystal was chose as the first-stage gain medium, the LBO and the KDP crystal were used for the second-stage and third-stage, respectively. Through numerical simulations, the output gain and gain stability were obtained for three stage optical parametric chirped pulse saturated amplification. In the case of pumping intensity jitter less than 6%, the output gain jitter of the OPCPA system is less than 1%. In the case of PPKTP crystal choosed as the first-stage quasi-phase matching gain medium, with a pump peak intensity of 30 MW/cm2, which is far from damaging the PPKTP crystal, the saturation amplificated gain is 2 × 105 and the conversion efficiency is 20%.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2004年第12期1540-1544,共5页
High Power Laser and Particle Beams
基金
高温高密度等离子体物理国防重点实验室基金资助课题(51480040204JW0701)
关键词
光参量啁啾脉冲放大(OPCPA)
增益稳定性
饱和放大
Gain control
Laser pulses
Light amplifiers
Light propagation
Numerical methods
Optimization
Stability
