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Journal of Modern Optics

Cooperative Effects on Transient Spectral Hole Burning

X. Li, D. L. Lin, Thomas F. George

Published Sep 1, 1993• 0 citations
Publisher

Abstract

The nonlinear optical susceptibility is calculated for a system of two closely located bound excitons by treating the test field as a perturbation in pump-probe experiments. The effect of photon trapping on the spectral hole burning is found to be dramatic in the transient regime for both on-resonance and off-resonance pumping.
DOI
10.1080/09500349314551721

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A model calculation is presented that describes the features of spectral-hole burning measurements performed under conditions of femtosecond transient excitation and probing. Pump-induced changes in the spectrum of probe transmittance arise not only from changes in level population (hole burning), but also from the presence of pump polarization during the probe, and from perturbations of the decay of the probe polarization. These latter effects give rise to oscillating differential transmittance spectra when the (shorter) probe pulse arrives prior to the peak of the pump noise. Only when the probe pulse follows the bulk of the pump pulse does the level population effect dominate the spectrum, so that one can observe dynamic hole-burning effects without distortion.>
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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.
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