Temporal Coherence of Ultrashort High-Order Harmonic Pulses
Temporal Coherence of Ultrashort High-Order Harmonic Pulses
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DOI：
10.1109/cleoe.1998.719518
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发表时间：
1998-07
期刊：
影响因子：
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通讯作者：
Marco Bellini;C. Lyngå;Andrea Tozzi;M. Gaarde;Theodor W. Hänsch;Anne L'huillier;C. Wahlström
中科院分区：
文献类型：
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作者：
Marco Bellini;C. Lyngå;Andrea Tozzi;M. Gaarde;Theodor W. Hänsch;Anne L'huillier;C. Wahlström
我们研究了100ps激光脉冲聚焦到Ar气体射流中产生的高次谐波(高达15次)的时间相干性。我们测量当两个空间分离的谐波源干涉远场时产生的干涉条纹的可见度，作为两个谐波源之间的时间延迟的函数。一般来说，我们发现长的相干时间，与预期的谐波脉冲持续时间相当。对于一些谐波，干涉图样表现出两个区域，具有显著不同的相干时间。这些结果可以用不同的电子轨迹来解释，这些轨迹有助于产生谐波。[S0031-9007(98)05569-7]。
We have studied the temporal coherence of high-order harmonics (up to the 15th order) produced by focusing 100 fs laser pulses into an argon gas jet. We measure the visibility of the interference fringes, produced when two spatially separated harmonic sources interfere in the far field, as a function of the time delay between the two sources. In general, we find long coherence times, comparable to the expected pulse durations of the harmonics. For some of the harmonics, the interference pattern exhibits two regions, with significantly different coherence times. These results are interpreted in terms of different electronic trajectories contributing to harmonic generation. [S0031-9007(98)05569-7].