MODES OF RESONATORS WITH DISPERSIVE PHASE-CONJUGATE MIRRORS

We investigate the transverse and longitudinal modes of a resonator co nsisting of a spherical mirror, a Gaussian aperture, and a dispersive phase-conjugate mirror (PCM). The photorefractive PCM introduces spati al dispersion in the form of lateral and focal shifts along with tempo ral dispersion. For both degenerate and nondegenerate operation, the d ecentered Gaussian beam was found to be a mode whose peak intensity is displaced from the resonator axis. In the nondegenerate case, the com ponents of a mode oscillating at a pair of frequencies that are up and down shifted from the pump frequency by the same amount have differen t spatial distributions, so that the intensity pattern moves periodica lly across the output mirror. The resonance frequencies of the longitu dinal modes are calculated numerically. (C) 1997 Optical Society of Am erica.