Observation of a train of attosecond pulses from high harmonic generation
Observation of a train of attosecond pulses from high harmonic generation
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DOI：
10.1126/science.1059413
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发表时间：
2001-06-01
期刊：
影响因子：
56.9
通讯作者：
Agostini, P
中科院分区：
文献类型：
--
作者：
Paul, PM;Toma, ES;Agostini, P
原则上，通过在气体射流中聚焦飞秒激光脉冲获得的叠加高次谐波的时间拍频可以产生一系列非常短的强度尖峰，这取决于谐波的相对相位。我们提出了一种通过双光子、双色光电离测量这种相位的方法。我们发现谐波在时域中被锁定在相位上并形成一串250阿秒脉冲。谐波产生可能是阿秒时间分辨测量的一个有希望的源。
In principle, the temporal beating of superposed high harmonics obtained by focusing a femtosecond laser pulse in a gas jet can produce a train of very short intensity spikes, depending on the relative phases of the harmonics. We present a method to measure such phases through two-photon, two-color photoionization. We found that the harmonics are Locked in phase and form a train of 250-attosecond pulses in the time domain, Harmonic generation may be a promising source for attosecond time-resolved measurements.