双色中红外激光场延迟及相位调控产生水窗区间光子  

Controlling laser delay and phase of two-color mid-infrared field to produce water window photon

作　　者：李义[1] 冯立强[1] LI Yi;FENG Li-Liang(College of Science,Liaoning University of Technology,Jinzhou 121001,China)

机构地区：[1]辽宁工业大学理学院,锦州121001

出　　处：《原子与分子物理学报》2023年第1期101-105,共5页Journal of Atomic and Molecular Physics

基　　金：辽宁省自然科学基金面上项目(2019-MS-167)。

摘　　要：理论研究了双色中红外激光场时间延迟及相位对高次谐波光谱的影响.结果表明:当激光延迟为-1.0 fs,激光相位为0.2π和0时,谐波截止能量可以得到有效延伸,并且获得一个超宽水窗区间谐波连续平台区.此外,谐波光谱的延伸与控制场波长关系不大,即,在上述激光延迟和相位下,控制场波长在2300 nm到2700 nm区间时都可获得水窗区谐波光谱.最后,叠加光谱连续区的谐波可获得35 as的水窗区孤立阿秒脉冲.The effects of time delay and phase of two-color mid-infrared field on the high-order harmonic spectra have been theoretically studied.It is shown that when the time delay and phases are chosen to be-1.0 fs,0.2πand 0,respectively,the harmonic cutoff can be remarkably extended,showing an ultrabroad water window harmonic plateau.Furthermore,the harmonic extension is not very sensitive to the controlling laser wavelength.For instance,in the cases of the above time delay and phases,the water window harmonic plateau can also be obtained when the controlling wavelength is chosen from 2300 nm to 2700 nm.Finally,by superposing the harmonics on the spectral plateau,the water window isolated attosecond pulse with the duration of 35 as can be obtained.

关 键 词：高次谐波 激光延迟 激光相位 双色场 水窗区谐波光谱 

分 类 号：O562.4[理学—原子与分子物理]