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Quantum Electronics

Investigation of a nonlinear multicomponent medium of a laser with controlled external feedback

Аникеев Борис Васильевич, D. V. Sin'ko

Published Jun 30, 1997• 0 citations
Publisher

Abstract

A method for investigating the photorefractive effect in electro-optical crystals by intracavity spectroscopy, proposed earlier by the authors, is generalised to several other nonlinear optical effects. An analysis is made of the feasibility of measuring the characteristics of nonlinear optical media in which several quantum transitions with different lifetimes can take place. The effectiveness of the method is demonstrated by an investigation of a DKDP crystal at room temperature.

DOI
10.1070/qe1997v027n06abeh000979

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A method for investigating the photorefractive effect in electro-optical crystals by intracavity spectroscopy, proposed earlier by the authors, is generalised to several other nonlinear optical effects. An analysis is made of the feasibility of measuring the characteristics of nonlinear optical media in which several quantum transitions with different lifetimes can take place. The effectiveness of the method is demonstrated by an investigation of a DKDP crystal at room temperature.
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We investigate theoretically the main elements of manipulation of light pulses---strong nonlinear slowing down, trapping, and release on demand---in photorefractive nonlinear media. This includes a study of the slowing-down characteristics, such as delay time, amplification factor, and nonlinear broadening, for different types of photorefractive response and interaction geometries, as well as an analysis of the shape of pulses released after a long storage. The photorefractive manipulation method is shown to be applicable at ambient temperatures, low light intensities, and wide spectral ranges.
A theoretical model is constructed for four-wave mixing in a photorefractive crystal where a transmission grating is formed by the drift–diffusion nonlinearity mechanism in the absence of an external electrostatic field and the response of the medium is nonlinear in respect of the modulation parameter. A comparison is made with a model in which the response of the medium is linear in respect of the modulation parameter. Theoretical models of four-wave and two-wave mixing are also compared with experiments.
It is known that two-wave coupling in photorefractive crystal may result in an intensity-dependent phase shift as well as energy transfer between the two waves without phase crosstalk. In a sense, this kind of phase shift is similar to the intensity-dependent refractive-index effects in Kerr media. Consequently, optical bistability can be established in an optical cavity with a photorefractive crystal. We formulate the model and get the expected bistable transmission with numerical simulations. Several cases, including that of the codirectional coupling and the contradirectional coupling, are considered. The effects of the photorefractive crystal’s distribution absorption and the spatial phase shift between the index grating and the light interference pattern in the crystal on the nonlinear transmission characteristics have also been studied. It is interesting to note that the output of the pumping wave is dependent on the cavity intensity and thus shows bistable behavior with respect to the cavity input as well.