Optical resonators containing a phase conjugate mirror (PCM) have been a subject of great interest, where the PCM is employed as an end mirror of the resonator cavity for intracavity aberration correction.1 Recent theoretical analysis indicates that the insertion of a PCM inside a ring laser cavity results in a reduction of the lock-in threshold and reduces the imbalance between the amplitudes of the oppositely directed traveling waves.2 In the extreme case of phase conjugate oscillation without conventional gain, lock-in can be completely eliminated.3

© 1990 Optical Society of America

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