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Springer eBooks

Laser-Assisted Multicolor Photoionization of Atoms with Higher Harmonics

Valérie Vëniard, Richard Taïeb, A. Maquet

Published Jan 1, 1998• 0 citations
Publisher
DOI
10.1007/978-1-4757-9241-6_46

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Two-color coherent control of atomic multiphoton ionization with high-order harmonics: time-dependent Schrödinger equation treatment

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We present a theoretical study of the main characteristics of two-color photoionization spectra obtained when atoms are subjected to an intense radiation pulse containing the fundamental of an infrared laser and one of its higher harmonics. The frequency of the latter is chosen to be high enough that the atom can be ionized by a single photon. The calculation is performed by numerical integration of the time-dependent Schrödinger equation for a (three-dimensional) hydrogen atom. We present the general properties of the spectra and angular distributions as well as the possible occurrence of interferences between the laser-assisted process and above-threshold ionization. Our results indicate that such interference effects, which can lead to partial coherent control of the photoionization process, can be observed at moderate laser intensities within the reach of currently operated laser and harmonic sources.

Journal of the Optical Society of America B•Feb 1, 1996•25 citations
We discuss, via a numerical calculation, the main properties of atomic photoelectron spectra, as they would be obtained by using a radiation pulse containing higher harmonics together with the laser which has been used to generate them. We address more precisely the physically relevant situation in which the harmonics have much weaker intensities than the one of the laser. In such multicolor photoionization processes, the atom can simultaneously absorb harmonic UV photons and exchange, i.e. absorb and/or emit (via stimulated emission) laser IR photons. An interesting outcome of our study is to show that such new effects should be observable with currently developed harmonic sources.
We present a theoretical study of the main characteristics of two-color photoionization spectra obtained when atoms are subjected to an intense radiation pulse containing the fundamental of an infrared laser and one of its higher harmonics. The frequency of the latter is chosen to be high enough that the atom can be ionized by a single photon. The calculation is performed by numerical integration of the time-dependent Schrödinger equation for a (three-dimensional) hydrogen atom. We present the general properties of the spectra and angular distributions as well as the possible occurrence of interferences between the laser-assisted process and above-threshold ionization. Our results indicate that such interference effects, which can lead to partial coherent control of the photoionization process, can be observed at moderate laser intensities within the reach of currently operated laser and harmonic sources.