Temporal and angular resolution of the ionization-induced refraction of a short laser pulse in helium gas

被引:89
作者
Chessa, P [1 ]
De Wispelaere, E
Dorchies, F
Malka, V
Marquès, JR
Hamoniaux, G
Mora, P
Amiranoff, F
机构
[1] Ecole Polytech, ENSTA, Lab Opt Appl, F-91128 Palaiseau, France
[2] Univ Paris 06, Ecole Polytech, CNRS, CEA,LULI,UMR 7605, F-91128 Palaiseau, France
[3] Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France
[4] CNR, IFAM, I-56100 Pisa, Italy
关键词
D O I
10.1103/PhysRevLett.82.552
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The refraction of a short and intense laser pulse focused in helium gas has been studied both experimentally and numerically. Using the time-frequency correspondence of a 120 fs laser pulse linearly chirped to 1.8 ps, the ionization-induced refraction is resolved both temporally and angularly. Two-dimensional numerical simulations are performed to calculate the laser propagation, from the focusing lens to the detector. With such a simulation, we get a quantitative agreement with the experiment, both for the refraction of the chirped pulse and for the ionization-induced blueshifted spectrum of the compressed pulse. [S0031-9007(98)08310-0].
引用
收藏
页码:552 / 555
页数:4
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