Half-cycle cutoffs in harmonic spectra and robust carrier-envelope phase retrieval
Half-cycle cutoffs in harmonic spectra and robust carrier-envelope phase retrieval
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DOI：
10.1038/nphys463
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发表时间：
2007-01-01
期刊：
影响因子：
19.6
通讯作者：
Tisch, J. W. G.
中科院分区：
文献类型：
--
作者：
Haworth, C. A.;Chipperfield, L. E.;Tisch, J. W. G.
近年来，利用高次谐波辐射来创造和控制阿秒时间尺度上的事件已经以惊人的速度增长。通过使用载波包络相位（CEP）稳定和少周期激光系统，可以在前所未有的时间尺度上探测物理过程。在这里，我们报告的第一个实验观察高谐波发射在个别半周期的激光脉冲。我们表明，这些半周期的排放是非常敏感的CEP，提供了一个新的单次测量技术的CEP的路线。我们用这种技术测量了中心波长为800 nm、脉冲宽度为8.5 fs的脉冲的圆极化概率，测量精度为20 as（1 as = 1 × 10（-18）s）。通过对谐波谱进行适当的空间谱滤波，我们的计算表明，我们可以从单个半周期截止中分离出辐射，该截止对应于单个孤立的阿秒脉冲持续时间
In recent years the use of high-order harmonic radiation to create and control events on attosecond timescales has grown at a phenomenal rate. With the use of carrier-envelope phase (CEP) stabilization and few-cycle laser systems it is possible to probe physical processes on unprecedented timescales. Here, we report the first experimental observation of high-harmonic emission at individual half-cycles of a laser pulse. We show that these half-cycle emissions are extremely sensitive to the CEP, providing a route to a new single-shot measurement technique of the CEP. We use this technique to measure the CEP of an 8.5 fs pulse at a centre wavelength of 800 nm with an accuracy of 20 as (1 as = 1 x 10(-18) s). With appropriate spatio-spectral filtering of the harmonic spectra, our calculations show that we can isolate emission from an individual half-cycle cutoff, which corresponds to a single isolated attosecond pulse of duration