Brief Report

Application of the model of a set of harmonic oscillators in intense femtosecond laser pulsed field for the estimation of the limits of electron heating in insulators

I.B. Bogatyrev$^1$, A.N. Vasil’ev$^2$, U.V. Popov$^2$

Moscow University Physics Bulletin 2009. 64. N 4. P. 465

Article

Annotation

We study dynamics of harmonic oscillators system with continuously distributed frequencies irradiated by femtosecond laser pulse. This system is applied to the description of vertical transitions with conservation of the quasi-momentum between different branches of the conduction band at those points of the Brilloin zone at which the effective heating is possible. The model can be applied for the estimation of the high-energy tail of the electron distribution in insulators at intensities under optical breakdown. Analytic solution for electron energy distribution in oscillators system after heating by femtosecond laser pulse is obtained. It is shown that at laser field intensities above 3 TW/cm$^2$ with photon energy of 1.55 eV and pulse duration of 40 fs the electrons with energy above 10 eV are appeared.

Received: 2008 December 1

Approved: 2009 September 23

PACS:

78.47.+p Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter

Authors

I.B. Bogatyrev$^1$, A.N. Vasil’ev$^2$, U.V. Popov$^2$
$^1$Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia
$^2$Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia

Issue 4, 2009

Moscow University Physics Bulletin

Science News of the Faculty of Physics, Lomonosov Moscow State University

This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.