We present wave-optics calculations of the temporal and spatial evolution from
random noise of a double phase-conjugate mirror in photorefractive media that
show its image exchange and phase-reversal properties. The calculations show
that for values of coupling coefficient times length greater than two the
process exhibits excellent conjugation fidelity, behaves as an oscillator, and
continues to operate even when the noise required for starting it is set to
zero. For values less than two, the double phase-conjugation process exhibits
poor fidelity and disappears when the noise is set to zero.
© 1993 Optical Society of America
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