基于光参量过程直接产生高重频超短脉冲序列  

Direct generation of ultrashort pulse sequence by optical parametric process

作　　者：王文昊 周冰洁 章艳芳 王静 马金贵 张浩 钱列加 Wang Wenhao;Zhou Bingjie;Zhang Yanfang;Wang Jing;Ma Jingui;Zhang Hao;Qian Liejia(School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China;Department of Optical Science and Engineering,Fudan University,Shanghai 200433,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学物理与天文学院,上海200240 [2]上海无线电设备研究所,上海201109 [3]复旦大学信息科学与工程学院,上海200433 [4]上海交通大学李政道研究所,上海200240

出　　处：《强激光与粒子束》2023年第9期46-53,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(62122049);上海市青年科技启明星计划项目(21QA1404600)。

摘　　要：论证了单晶体光参量放大(OPA)过程在特定边界条件下满足频域宇称-时间(PT)反对称性。归一化的数值求解结果显示,OPA系统PT对称阈值点附近呈现增益跃变性质。对于存在位相失配的OPA,通过实时调控泵浦光强,即可控制系统PT对称性,论文基于相位失配OPA中可超快调控PT对称性的特性构建了超快光开关,一方面光开关与周期性幅度调制的泵浦光联合使用,可直接将连续激光转换为超短脉冲序列输出;另一方面,构建的光开关也可用于脉冲激光再压缩,有望用于中红外波等长波段超短种子源。论文提出的基于超快光开关直接产生超短脉冲序列的方案,由于不需要光学谐振腔,易于实现大于10 GHz的超高重复频率。This paper demonstrates that the single crystal optical parametric amplification process(OPA)satisfies spectral parity-time(PT)anti-symmetry under specific boundary conditions,and the PT symmetry thresholdpoint exhibits a gain jump property.For an OPA with phase mismatch,the PT symmetry of the system can becontrolled by instantaneous adjustment of the pump intensity.Based on this property,this paper constructs an ultrafastoptical switch,which can combine with amplitude modulated pump to directly convert continuous laser into anultrashort output pulse sequence.On the other hand,the optical switch can be used for further pulse compression and ispromising to be used as an ultrashort mid-infrared seed source.The proposed scheme is easy to directly generateultrashort pulse sequence with repetition rate higher than 10 GHz because the optical resonant cavity is not required.

关 键 词：二阶非线性光学 光学参量放大 超短脉冲序列 非厄米哈密顿量 频域宇称时间反对称 

分 类 号：O437[机械工程—光学工程]