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Soviet Journal of Quantum Electronics

Switching of the radiation frequency in a medium with a quadratic nonlinearity and an optical transistor based on this effect

A. A. Maǐer, K. Yu. Sitarskii

Published Nov 30, 1987• 1 citation
Publisher

Abstract

It is shown that abrupt transfer of radiation power is possible from one frequency to another at the output of a medium with a quadratic nonlinearity when its input is subjected to a small signal at the doubled frequency and the intensity of the signal is altered slightly under phase-matched interaction conditions and also in the case of deviation from such conditions. It is shown that an optical transistor can be constructed on the basis of this effect and that a giant gain can be achieved for a weak alternating signal.

DOI
10.1070/qe1987v017n11abeh010975

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It is shown that abrupt transfer of radiation power is possible from one frequency to another at the output of a medium with a quadratic nonlinearity when its input is subjected to a small signal at the doubled frequency and the intensity of the signal is altered slightly under phase-matched interaction conditions and also in the case of deviation from such conditions. It is shown that an optical transistor can be constructed on the basis of this effect and that a giant gain can be achieved for a weak alternating signal.
The scope of this paper is to revisit the use of quadratic crystals cut for second harmonic generation (SHG) with type II phase-matching in view of all-optical processing of light signal. The investigations on this topic mainly focused in the past years on the possibilities opened by cascading of quadratic nonlinearities in phase-mismatched conditions [1]. The goal of this paper is to remind the reader that various types of optical processing are achievable with sum and difference frequency generation in phase-matched position without the requirement for cascaded nonlinearities. In a first part we will report few examples of the use of difference frequency generation (or down conversion) for signal processing. In a second part we will show that type II SHG with unbalanced fundamental inputs may lead to coherent amplification or transistor like operation.
A device is proposed which is the optical analog of the transistor wherein a weak incoming optical signal directly controls a strong outgoing optical signal. The basic principle utilized in the proposed device is the strong dependence of second harmonic generation on the phase-matching condition. A weak incoming signal can perturb the indices of refraction in a birefringent material so that the second harmonic power derived from a pump beam is significantly affected. Large incremental power gain is shown to be possible. Tellurium is considered as an example.