Optics and Spectroscopy

, Volume 113, Issue 4, pp 383–387 | Cite as

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

  • E. Yu. Perlin
  • A. V. Ivanov
  • A. A. Popov
Condensed-Matter Spectroscopy


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.


Lower Conduction Band Band Extremum Laser Pulse Energy Density Electron Coulomb Interaction Initial Electron Concentration 
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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

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