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Le Journal de Physique Colloques

RESONANT INTRACAVITY PHASE CONJUGATION IN TWO AND THREE-LEVEL SYSTEMS

Govind Prasad Agrawal

Published Mar 1, 1983• 2 citations
Publisher

Abstract

A general theory of intracavity phase conjugation, applicable to any resonance situation, is developed. It is applied to discuss the cases of two-level and A-type three-level systems. The phase-conjugate reflectivity exhibits bistability and hysteresis in both cases.
DOI
10.1051/jphyscol:1983217

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A general formalism is developed to study intracavity phase conjugation through resonant degenerate four-wave mixing. The effects of spatial hole burning, arising from interference of the counterpropagating pump waves, are fully incorporated. The analysis is applied to discuss intracavity phase conjugation in nonlinear media that can be modeled using either a two-level system or a Λ-type three-level system. In both cases, the phase-conjugate reflectivity exhibits bistability for an appropriate choice of the input parameters. For a two-level system, the tuning characteristics of the Fabry–Perot cavity significantly affect the phase-conjugate spectrum that displays hysteresis when the cavity is detuned from the applied laser frequency.
Resonant degenerate 4-wave mixing (DFWM) has proven to be a powerful technique to generate phase conjugate (PC) wave fronts. In this contribution we consider the situation where the nonlinear medium is placed inside a Fabry-Perot cavity (Fig. 1). In this geometry, the intracavity pump intensity and, as a consequence, also the PC emission are expected to exhibit bistable switching /1,2/. With respect to practical applications, intracavity PC might be of interest, e.g., for probing an optical memory element or for Q-switching a resonator with a phase conjugating mirror. Only recently, however, first experimental studies on bistability in intracavity PC have been performed /3,4/.