Abstract

Stimulated Brillouin scattering (SBS) in a backward direction serves for many years as an effective tool of self-phase conjugation (PC) for giant laser pulses.^1,2 Recently an alternative type of the stimulated backscattering—the stimulated diffusion scattering (SDS) in photorefractive crystals—has been proposed to be used for PC of low power radiation.^3,4 Both effects can be reduced, in principle, to a two-wave mixing of an incident pump wave to be conjugated and of waves that are seeding in a backward direction usually by spontaneous scattering of the same pump wave by randomly distributed small-scale inhomogeneities of a medium (Fig. 1).

© 1994 IEEE