Laser chirp controlled relativistic few-cycle mid-infrared pulse generation  

作　　者：Dongao Li Guobo Zhang Jie Zhao Yanting Hu Yu Lu Hao Zhang Qianni Li Dongze Zhang Rong Sha Fuqiu Shao Zhengming Sheng Tongpu Yu 

机构地区：[1]Department of Physics,National University of Defense Technology,Changsha,China [2]Department of Nuclear Science and Technology,National University of Defense Technology,Changsha,China [3]Key Laboratory for Laser Plasmas(MOE)and School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai,China [4]Collaborative Innovation Center of IFSA,Shanghai Jiao Tong University,Shanghai,China [5]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2023年第5期76-84,共9页高功率激光科学与工程（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(No.2018YFA0404802);the National Natural Science Foundation of China(Nos.12005297,11875319,12135009,and 12275356);the Science and Technology Innovation Program of Hunan Province(No.2020RC4020);the Research Project of NUDT(No.ZK21-12);the Hunan Provincial Research and Innovation Foundation for Graduate Students(Nos.CX20200002,CX20200038,and CX20210062)。

摘　　要：Relativistic few-cycle mid-infrared(mid-IR)pulses are unique tools for strong-field physics and ultrafast science,but are difficult to generate with traditional nonlinear optical methods.Here,we propose a scheme to generate such pulses with high efficiency via plasma-based frequency modulation with a negatively chirped laser pulse(NCLP).The NCLP is rapidly compressed longitudinally due to dispersion and plasma etching,and its central frequency is downshifted via photon deceleration due to the enhanced laser intensity and plasma density modulations.Simulation results show that few-cycle mid-IR pulses with the maximum center wavelength of 7.9µm and pulse intensity of a_(MIR)=2.9 can be generated under a proper chirp parameter.Further,the maximum energy conversion efficiency can approach 5.0%.Such a relativistic mid-IR source is promising for a wide range of applications.

关 键 词：chirp laser pulses laser wakefield photon deceleration relativistic mid-infrared generation 

分 类 号：TN24[电子电信—物理电子学]