Abstract
Effects of external optical feedback on the behavior of input-cavity-field relations are investigated for an electron–phonon system inside an optical cavity exposed to an incident laser field. The external feedback by conventional mirrors and by phase-conjugate mirrors is considered separately. Steady-state results are obtained numerically for a typical phonon–exciton material of polydiacetylene. In the case of conventional external feedback, the threshold, the contrast, and the switching behavior of optical bistability can be changed by adjustment of the feedback parameters without causing any instability, whereas in the case of phase-conjugate feedback the cavity field intensity shows five states corresponding to a single input field intensity as long as the feedback is strong enough. However, all these states are unstable because of the amplified phase-conjugate reflection, which limits the application of phase-conjugate mirrors in optical multistabilities.
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