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Physics of the Solid State

Optical properties of semiconductors under strong pumping in the M-band region and two-photon probing of the biexciton state

P. I. Khadzhi, А.В. Коровай, D. V. Tkachenko

Published May 1, 2002• 4 citations
Publisher

Abstract

The behavior of the semiconductor dielectric susceptibility under the action of a strong laser pulse in the range of the luminescent M band and two-photon probe of a biexciton level is investigated. It is shown that the pronounced Autler-Towns effect occurs at the two-photon transition. The position of the absorption peaks is essentially determined by the amplitude and frequency of the pump field.

DOI
10.1134/1.1477476

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The behavior of the semiconductor dielectric susceptibility under the action of a strong laser pulse in the range of the luminescent M band and two-photon probe of a biexciton level is investigated. It is shown that the pronounced Autler-Towns effect occurs at the two-photon transition. The position of the absorption peaks is essentially determined by the amplitude and frequency of the pump field.
The hysteretical behavior of imaginary and real parts of the semiconductor susceptibility in the exciton range of spectrum taking into account the exciton-photon and elastic exciton- exciton interaction in the pump-probe regime depending on the intensity and frequency of the strong pump laser pulse and on the frequency of the test pulse is studied. The conditions of the emergence of the damping suppression and test pulse gain are determined. The abrupt red and blue shifts of the spectral position of the exciton absorption band depending on the intensity of the pump pulse are predicted.
The biexciton optical Stark-effect under resonant pumping between the exciton and biexciton levels is studied theoretically. The probabilities of biexciton two-photon absorption of a weak probe light and of one-photon biexciton-exciton transition are calculated. The optical Stark splitting manifests itself in two-photon biexciton absorption through two absorption peaks spaced 2 (Omega) apart. Omega is the Raby frequency. In the luminescence spectrum due to biexciton-exciton one-photon transition three luminescence maxima appear which are shifted with respect to the luminescence maximum in the case without pumping.