Analysis and evaluation of idler absorption for quasi-parametric chirped-pulse amplification
Quasi-parametric chirped-pulse amplification (QPCPA) can improve the signal amplification efficiency and stability by inhibiting the back conversion, in which the idler absorption plays a critical role. This paper theoretically studies the impacts of idler absorption on the QPCPA performance in both the small-signal and saturation regimes. We demonstrate that there exists an optimal idler absorption that enables the achievement of maximum pump depletion within a minimum crystal length. To overcome the reduction in small-signal gain induced by idler absorption, the configuration of gradient idler absorption is proposed and demonstrated as a superior alternative to constant idler absorption. The results provide guidelines to the design of state-of-the-art QPCPA lasers.
作者单位：China Academy of Engineering Physics
Key Laboratory for Laser Plasma (Ministry of Education)
Hu Dongxia,Tao Yudong,Ma Jingui,Wang Jing,Zhu Heyuan,Qian Liejia. Analysis and evaluation of idler absorption for quasi-parametric chirped-pulse amplification[J].Chinese Optics Letters,2018,16(12):12.