7 fs超快强激光驱动Ar原子产生支持单个阿秒脉冲的高次谐波连续谱  

Generation of High-Order Harmonic Continuum Supporting Single Attosecond Pulse in Argon Driven by Intense 7 fs Laser Pulse

作　　者：郑颖辉[1] 熊辉[1] 彭滟[2] 徐晗[2] 曾志男[1] 杨旋[2] 陈晓伟[1] 李儒新[1] 曾和平[2] 徐至展[1] 

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]华东师范大学物理系光谱学与波谱学教育部重点实验室,上海200062

出　　处：《光学学报》2006年第9期1439-1440,共2页Acta Optica Sinica

摘　　要：采用脉冲宽度为7 fs,脉冲能量为0.4 mJ的超快强激光脉冲与气体盒子中Ar原子作用获得了高次谐波截止区连续谱,并发现当驱动激光稳定在不同的载波包络相位时,高次谐波的谱结构、谱调制深度和连续谱的带宽都有很大区别。在某些载波包络相位时获得了平滑的连续谱,调制深度小于17%,连续带宽达10 eV,从而支持时域上获得变换极限500 as的单个阿秒脉冲。High-order harmonic continuum in the cutoff region is demonstrated with an argon gas cell driven by 7 fs/0.4 mJ ultrashort intense laser pulses. It is found that the spectral structure, modulation depth and continuum bandwidth vary greatly when the carrier envelope phase （CEP） of driving laser pulse is stabilized at different value, At some CEP value, a smooth continuous spectrum with modulation depth less than 17% and 10 eV continuum bandwidth is achieved, supporting a transform-limited single 500 as pulse in time domain.

关 键 词：超快光学 阿秒脉冲 高次谐波 载波包络相位 

分 类 号：O437[机械工程—光学工程]