Regenerative amplifiers with one phase-conjugate mirror

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Abstract
We study the operating characteristics of a cavity with a gain medium inside and one phase-conjugate mirror as a regenerative amplifier. We show that, for this cavity to work efficiently, the phase-conjugate mirror must have a reflectivity in a certain range determined by the reflectivity of the ordinary mirror. The difference between the phase shift of the incident wave and twice that introduced in the phase-conjugation process should be nonzero.