高次谐波产生的阿秒脉冲序列观测。

Observation of a train of attosecond pulses from high harmonic generation.

作者信息

Paul P M, Toma E S, Breger P, Mullot G, Auge F, Balcou P, Muller H G, Agostini P

机构信息

Commissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.

出版信息

Science. 2001 Jun 1;292(5522):1689-92. doi: 10.1126/science.1059413.

DOI:10.1126/science.1059413

PMID:11387467

Abstract

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.

摘要

原则上，通过将飞秒激光脉冲聚焦在气体射流中获得的叠加高次谐波的时间拍频，根据谐波的相对相位，可以产生一系列非常短的强度尖峰。我们提出了一种通过双光子、双色光电离来测量此类相位的方法。我们发现谐波在相位上是锁定的，并且在时域中形成一系列250阿秒脉冲。谐波产生可能是阿秒时间分辨测量的一个有前途的光源。