Temporal instabilities in the double phase conjugate mirror
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abstract
The temporal behavior of the double phase conjugate mirror (DPCM) is studied theoretically. This device generates the phase conjugate wave with only one pump beam if the coupling strength is above some threshold value. It is shown that if such a conjugate mirror is driven by an extra pump beam, it will produce very unstable output signal if the intensity of ths source is weak. The reason for such behavior lies in the simultaneous presence of two mechanisms of wave mixing: pure self-oscillations with shifted frequency and degenerate wave mixing due to the driven pump. For a strong pump beam the oscillations are damped, and the output signal is stable again.