6. TERAHERTZ QUASI-OPTICS

MULTI-PHOTON IONIZATION BY A TWO-COLOR LASER PULSE

Igor A. Kotelnikov
1. Budker Institute of Nuclear Physics SB RAS Novosibirsk, Russian Federation
2. Novosibirsk State University Novosibirsk, Russian Federation
kia999@mail.ru
Aleksandr P. Shkurinov
1. Department of Physics and International Laser Center M.V. Lomonosov Moscow State University Moscow, Russia
The material was received by the Editorial Board: 10.09.2010
A method of imaginary time [1] is used to calculate the probability of multi-photon ionization of atoms by a femtosecond laser field with an admixture of the second harmonic. The conditions for the second harmonic to dominate over the first harmonic in the course of ionization of atoms are found. It is shown that the average momentum of the photoelectrons ejected from an atom depends on the phase shift between the first and second harmonics, as well as on their mutual polarization. Asymptotic formulas for the ionization rate and the average momentum of photoelectrons are obtained. They generally confirm predictions of a phenomenological model based on the classical views [2].

Keywords:
multi-photon ionization, femtosecond laser, terahertz radiation.
УДК 537.563.5

MULTI-PHOTON IONIZATION BY A TWO-COLOR LASER PULSE
References: Kotelnikov I. A., Shkurinov A. P. MULTI-PHOTON IONIZATION BY A TWO-COLOR LASER PULSE. Vestnik NSU. Series: Physics. 2010, vol. 5, no. 4. P. 108–112. DOI: 10.54362/1818-7919-2010-5-4-108-112