We have demonstrated bistability in a phase-conjugate resonator containing an intracavity saturable absorber. The saturable absorber was a film of fluorescein-doped boric acid glass. The state of the resonator is determined by an external control beam incident upon the saturable absorber. When the resonator is switched to the on state by means of the control beam, it remains in that state even with the control beam turned off.
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McCahon et al. (1992) studied this question.
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