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physica status solidi (b)

Polarization Self-Action Effect and Absorption Saturation in CdSe Single Crystals

Vasyl P. Kunets

Published Sep 1, 1998• 2 citations
Publisher

Abstract

The nonlinear optical transmission of CdSe single crystals and saturation thresholds at different polarizations of the pumping wave are studied in a range of the exponential absorption tail. Theoretical calculations performed in the framework of a two-level model with the twofold degenerate ground state corresponding to the optical transitions in E ⟂ C and E‖ C polarizations are also presented. Results obtained for the absorption saturation regime clearly witnesses in favour of the polarization self-action effect and relaxation processes between transitions polarized orthogonally.

DOI
10.1002/(sici)1521-3951(199809)209:1<179::aid-pssb179>3.0.co;2-0

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The nonlinear optical transmission of CdSe single crystals and saturation thresholds at different polarizations of the pumping wave are studied in a range of the exponential absorption tail. Theoretical calculations performed in the framework of a two-level model with the twofold degenerate ground state corresponding to the optical transitions in E ⟂ C and E‖ C polarizations are also presented. Results obtained for the absorption saturation regime clearly witnesses in favour of the polarization self-action effect and relaxation processes between transitions polarized orthogonally.
New concepts are developed to describe a wide area of nonlinear systems involving the phase relaxation peculiarities for the degenerate two-level system under the resonant optical excitation. Nonlinear susceptibility of the two-level system becomes anisotropic, and self-induced changes of polarization (SICP) are developed to the large (gigantic) magnitudes. The nonlinearities of two different natures are considered: the saturation of absorption and the resonant optical reorientation of anisotropic defects. For these particular cases, the SICP effects manifest themselves at a field much lower than that in traditional nonlinear optics. The larger magnitudes of the effects offer good possibilities for the development of optical devices based on the new physical principles. Various applications of SlOP effects are demonstrated, including the spectroscopic investigations of impure cubic crystals, optical diagnostics, optical storage, information processing, and the development of new optical devices.
Abstract Nonlinear absorption of a probe field in a system of degenerate levels of an atom characterized by a total moment of J = 1 in unidirectional waves is studied analytically and numerically taking into account saturation by its own spontaneous emission (OSE). The trends in changes of the amplitude and frequency characteristics of the nonlinear resonance associated with open and closed types of transitions for different polarizations of the waves that are introduced by self-saturation are established. Specific manifestations of the effect, including those related to magnetic coherence of levels, are revealed.
The shape of the resonance of a saturated absorption is calculated at an arbitrary intensity of a probe field. It is revealed that, in the case of orthogonal polarizations of strong and probe fields, an increase in the intensity of the probe field can invert the shape of the nonlinear resonance of clearing of the medium, changing it to the resonance of absorption. The saturation of optical transitions by intrinsic spontaneous radiation increases the contrast of the inverted resonance of saturation and narrows its width. In the case of parallel polarizations of the optical fields, an absorption peak can arise in the shape of the nonlinear resonance upon splitting of the lower state.
Abstract The physical processes forming the saturated absorption resonance spectra at a number of degenerate atomic transitions at their interaction with coherent optical fields and incoherent ield of spontaneous radiation of excited atoms are studied numerically. The features of behavior of nonlinear resonance spectra depending on the degree of degeneration and relaxation parametersof level transitions, character of polarizations and intensities, as well as direction of propagation of optical fields are analyzed.
The form of the saturated absorption resonance for atomic transition J=1-J=1 at arbitrary intensities of a probe light field is calculated. The influence of the saturation effect of optical transitions by own spontaneous radiation on the form of a nonlinear resonance is researched. It is revealed, that in case of orthogonal polarizations of strong and probe fields the increase of the probe field intensity can result in inversion of the shape of a nonlinear resonance. The saturation effect of optical transitions by own spontaneous radiation increases contrast of the inverted resonance of saturation and narrows its spectrum. In case of parallel polarizations of optical fields the peak of absorption can arise in the shape of nonlinear resonance at splitting of the lower atomic state.