高能超宽带光参量啁啾脉冲放大过程中的空间相位演变特性研究  

Spatial Phase Evolution Characteristics in the Process of High⁃Energy Ultra⁃Wideband OPCPA

作　　者：薛普凯 王傲天 李进峰[1] 於亮红[1] 梁晓燕[1] Xue Pukai;Wang Aotian;Li Jinfeng;Yu Lianghong;Liang Xiaoyan(State Key Laboratory of Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;College of Materials Science and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [2]中国科学院大学材料科学与光电技术学院,北京100049

出　　处：《中国激光》2024年第11期120-130,共11页Chinese Journal of Lasers

基　　金：国家重大科技基础设施研究计划(2017YFE0123700);上海市领军人才资助项目(20SR014501);国家自然科学基金(11804349);中国科学院青年创新促进会资助项目(2019247);上海市科委科技创新行动计划(19142202500)。

摘　　要：基于高掺氘DKDP晶体的光参量啁啾脉冲放大(OPCPA)技术是实现百拍瓦(100 PW)超强超短激光脉冲放大的主要技术路线之一。基于SEL-100 PW激光装置OPCPA高能主放大系统的设计,研究了高能量泵浦光的空间近场分布和相位分布对高能量、超宽带OPCPA过程中信号光空间相位演变特性的影响。仿真计算结果表明:在非共线OPCPA过程中,信号光空间相位分布的变化主要由泵浦光空间强度分布和相位分布引起;在严格的相位匹配条件下,泵浦光光强呈6阶超高斯分布,当低阶相位畸变为1λ时,放大信号光的空间相位畸变为10^(-2)~10^(-4)rad,该值可以忽略,而且信号光相位空间分布与泵浦光相位空间分布梯度线性相关;在相位失配条件下,泵浦光光强将严重影响信号光的空间相位分布。本研究结果为基于高能、超宽带OPCPA技术路线的100 PW激光放大和波前优化提供了理论支持。Objective Ultra-short ultra-intense lasers can provide unprecedented extreme physical conditions and new experimental methods,leading to significant applications in laser acceleration,plasma physics,strong field physics,and high-energy density physics.OPCPA technology is an important method for realizing ultrashort laser amplification.Currently,the highest output peak power based on OPCPA technology is up to 4.9 PW.To further increase the peak power,larger-size crystals are required,and the gain spectrum width can be compressed to tens of femtoseconds.The extreme light physical line station(SEL),an integral part of the hard X-ray free electron laser(SHINE)project,a significant national science and technology infrastructure in China,is undertaking the construction of an ultra-short and ultra-intense laser(SEL-100 PW),aiming for a remarkable peak power of 100 PW.The interaction between the ultra-high focused intensity produced by a 100 PW laser and hard X-ray free electron laser is used to explore the strong field quantum electrodynamics(QED)and other frontier science and technology fields.For ultra-intense and ultra-short laser-matter interaction experiments,the focused peak power density(focused intensity)of the laser is one of the most important technical indexes,which requires ultra-high peak laser power and a focused focal spot close to the diffraction limit level.The ability of a laser to focus near the diffraction limit is primarily limited by its spatial phase(wavefront)distortion.In addition to the static wavefront aberration introduced by optical component processing and mounting errors,dynamic wavefront aberration during the laser amplification process is also an important influencing factor.Additionally,the near-field spatial distribution of a laser beam determines the safety of highenergy lasers during transmission.To study the dynamic phase evolution of the 100 PW laser OPCPA high-energy main amplifier,this study focuses on the three-wave beam quality evolution in the process of OPCPA amplification.Fu

关 键 词：激光光学 光学参量啁啾脉冲放大 百拍瓦 数值模拟 波前畸变 

分 类 号：O436[机械工程—光学工程]