We theoretically study reflection of light by a phase-conjugating mirrorpreceded by a partially reflecting normal mirror. The presence of a suitablychosen normal mirror in front of the phase conjugator is found to greatlyenhance the total phase-conjugate reflected power, even up to an order ofmagnitude. Required conditions are that the phase-conjugating mirror itselfamplifies upon reflection and that constructive interference of light in theregion between the mirrors takes place. We show that the phase-conjugatereflected power then exhibits a maximum as a function of the transmittance ofthe normal mirror.
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