Abstract
A technique of spatial coherence control, based on the synchronous amplification of a radiation in LiF crystals with F −2 color centers, is demonstrated. Spatial radiation distributions of stimulated Raman scattering (SRS) in oxide crystals were investigated under picosecond laser excitation. Low spatial radiation coherence was revealed for both the transient and quasi-stationary SRS. Spatially incoherent SRS was transformed to spatially coherent radiation as a result of phase—locked picosecond synchronous laser pumping of nonlinear Raman and LiF: F −2 crystals and the Stokes radiation amplification in the color center crystal.
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