We study the mechanism of operation of a ring-cavity self-pumped phase-conjugate mirror and focus our interest on the influence of reflection gratings on the response time and the reflectivity of the mirror. Our ring-cavity self-pumped phase-conjugate mirror is constructed around an Fe-doped KNbO3 crystal. In the analysis we consider six possible two-wave-mixing processes in the photorefractive crystal and select the crystal orientation that maximizes these couplings in the desired two-wave-mixing processes. By use of a vibrating mirror in the ring cavity or a decrease in the coherence length of the laser below the length of the ring cavity, the response time becomes short and the reflectivity increases. The results show that the buildup of reflection gratings in a ring-cavity self-pumped phase-conjugate mirror presents an obstacle to good performance.
© 1997 Optical Society of AmericaPDF Article