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双色激光场中极端远紫外超连续谱相干辐射产生

Generation of an ultra-broad extreme ultraviolet supercontinuum in a two-color laser field

  • 摘要: 通过脉宽为周期量级的超快强场激光脉冲与惰性气体原子的极端非线性相互作用,能够产生单个的阿秒量级的极端远紫外光脉冲。然而,现有的周期量级的激光脉冲的最短脉宽仍在两个光周期左右,尚不足以支持产生脉宽短于100as的单个极端远紫外脉冲。文章作者首次提出通过在一个周期量级(如6fs)激光脉冲上再叠加一个强度较弱但相对位相精确控制的二倍频激光,能够直接实现单个的65as光脉冲。如进一步经过位相补偿,将有望产生一个脉宽仅为23as的单脉冲,从而将阿秒光脉冲的时间宽度推进到短于一个原子时间单位。

     

    Abstract: Single isolated attosecond (as) extreme ultraviolet (XUV) pulses can be generated via the nonlinear optical interaction between intense few-cycle laser fields and noble gas atoms. However, limited by today′s ultrashort pulsed laser technology, currently the shortest pulse duration of the few-cycle optical pulses is about two cycles, which is still not sufficiently short for generating single sub-100 as XUV pulses. Therefore, we propose to superimpose a relative-phase-controlled weak second-harmonic wave on the intense few-cycle pulse (e.g. 6fs) by which a single 65 as XUV pulse can be directly generated without any phase compensation process. Further, if the phase dispersion can be properly compensated, a single 23 as XUV pulse can be produced, which is below one atomic time unit (24 as).

     

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