Optics and Spectroscopy

, Volume 113, Issue 4, pp 383–387

Interband phototransitions involving free electrons: Part II. Crystals with an indirect band gap

Condensed-Matter Spectroscopy

DOI: 10.1134/S0030400X12100086

Cite this article as:
Perlin, E.Y., Ivanov, A.V. & Popov, A.A. Opt. Spectrosc. (2012) 113: 383. doi:10.1134/S0030400X12100086

Abstract

Nonlinear absorption of laser radiation with a photon energy lower than the indirect band gap of crystal has been considered. It is shown that, as in the case of direct-gap materials, single-photon resonance at the transitions between two conduction bands even at radiation intensities j ∼ 105–106 W/cm2 yields a range of j values where optical absorption and concentration of nonequilibrium electron-hole pairs increase very sharply with an increase in j.

Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Center of Information Optical TechnologiesSt. Petersburg State University of Information Technologies, Mechanics, and OpticsSt. PetersburgRussia