High beam quality and angular control are important functions for laser sources used in optronic and industrial applications. Phase conjugation via Stimulated Brillouin Scattering (SBS) is a promising technique,1,2 which is actively studied in order to achieve near-diffraction-limited high power output beams in master oscillator-double pass amplifier laser sources.3,4 Phase conjugation gives the ability to compensate for phase distortions arising from the inhomogeneous heat load in the bulk of the amplifier. A relevant property of nonlinear mirrors is that the conjugated beam returns exactly on the path of the incident beam.

© 1991 Optical Society of America

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