Analysis and evaluation of idler absorption for quasi-parametric chirped-pulse amplification

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2018,（12）
• 页码范围: 65-69
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201816.121901

摘要

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 Letter 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.