Two- and three-photon ionization of rare gases using femtosecond harmonic pulses generated in a gas medium - art. no. 031404

Authors
Descamps, D Roos, L Delfin, C L'Huillier, A Wahlstrom, CG
Citation
D. Descamps et al., Two- and three-photon ionization of rare gases using femtosecond harmonic pulses generated in a gas medium - art. no. 031404, PHYS REV A, 6403(3), 2001, pp. 1404
Citations number
24
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW A
ISSN journal
10502947 → ACNP
Volume
6403
Issue
3
Year of publication
2001
Database
ISI
SICI code
1050-2947(200109)6403:3<1404:TATIOR>2.0.ZU;2-E
Abstract
The fifth harmonic of a 60-fs 10-Hz terawatt titanium:sapphire laser genera ted in Xe gas is used to ionize Xe and Kr atoms by nonresonant two-photon a bsorption and At atoms through a quasiresonant three-photon process. At rel atively low harmonic yields, the variation of the number of Kr and Xe ions with the number of harmonic photons is quadratic. At high harmonic yields, it deviates from a quadratic behavior, which we attribute to the influence of ionization in the harmonic process distorting the harmonic wave front. T he two-photon ionization cross sections in Xe and Kr at 160 nm are found to be comparable.