Tunable soft-x-ray radiation hy high-order harmonic generation

被引：59

作者：

Altucci, C ^{[1
]}

Bruzzese, R

de Lisio, C

Nisoli, M

Stagira, S

De Silvestri, S

Svelto, O

Boscolo, A

Ceccherini, P

Poletto, L

Tondello, G

Villoresi, P

机构：

[1] Univ Naples Federico II, INFM, Dipartimento Sci Fis, Naples, Italy

[2] Univ Basilicata, Dipartimento Chim, I-85100 Potenza, Italy

[3] Politecn Milan, Dipartimento Fis, INFM, I-20133 Milan, Italy

[4] INFM, Unita padova, Dipartimento Elettron & Informat, Padua, Italy

来源：

PHYSICAL REVIEW A | 2000年 / 61卷 / 02期

关键词：

D O I：

10.1103/PhysRevA.61.021801

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have investigated the effect of free electrons on the spectral properties of high-order harmonics generated by 30-fs Ti:sapphire laser pulses in a neon gas jet. Our observations clearly indicate the possibility of continuously tuning the harmonic wavelength in the region below 20 nm, by taking advantage of the blue shift of the harmonic wavelength induced by the presence of free electrons in the gas. We have experimentally demonstrated that this allows one to cover the entire spectral region between two consecutive harmonics of the unshifted spectrum. Different amounts of blue shift are imparted:by simply changing the gas jet position relative to the laser beam waist, namely, by varying the effective laser intensity experienced by the gas jet when it is moved across the focal region. We have also interpreted the experimental results in terms of a simple model of the generation process based on the tunnel ionization of:an atom exposed to an ultraintense laser field.

引用

页数：4

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