摘要
在基于钛宝石啁啾脉冲放大(CPA)技术获得拍瓦级输出的激光装置中,光谱发射截面的不同和饱和放大的影响会使放大光谱产生增益窄化和光谱红移。光谱红移效应普遍存在于激光放大过程中,尤其在高能量饱和放大时更加严重。基于中国科学院上海光学精密机械研究所5.0PW激光装置的实验结果,针对Apollon-10PW激光装置的光谱控制,在理论上提出一种基于光-光同步放大的光谱整形技术,用以抑制高能量放大过程中的光谱红移。该技术基于传统的放大模型,通过在功放级引入短脉冲抽运,利用抽运光和啁啾种子光同步放大的方式抑制了光谱的红移。该技术无需引入任何其他光学器件,也不会引入附加损耗,操作简单。数值模拟结果表明,利用该技术可以有效地对放大的光谱进行整形,抑制了光谱红移效应。
In the petawatt（PW）-class ultra-intense ultra-short laser system based on the Ti：sapphire（Ti：S）chirped pulse amplification（CPA）technique,there is gain narrowing and redshift of the spectrum caused by the different spectral emission cross section and the effect of saturation amplification.The redshift of the spectrum appears widely in the process of laser amplification,especially in the high energy and saturation amplification process.In this paper,aiming at the spectrum control of Apollon-10 PW,we theoretically propose a new spectral shaping technique to suppress redshift of the spectrum in saturated laser amplifiers based on optical-optical synchronization amplification.The technique is based on the experimental results of 5.0 PW laser system in Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences.The technique is based on the conventional amplification model and optical-optical synchronization amplification through introducing the pump with short pulse width in power amplifier.The technique does not need to introduce other optical devices and does not introduce additional losses,and its operation is simple.Theoretical simulations show that the technique can effectively realize the shaping of amplified spectrum,which suppresses the redshift effect of the spectrum.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第12期11-17,共7页
Chinese Journal of Lasers
基金
国家自然科学基金(61322502
61535009)
长江学者和创新团队发展计划资助课题(IRT13033)
关键词
激光光学
超强超快激光
啁啾脉冲放大
钛宝石晶体
光谱整形
laser optics
ultra-intense ultra-fast optics
chirped pulse amplification
Tit sapphire crystal
spectrum shaping
