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Wide-angle narrowband optical filter using phase conjugation by stimulated Brllioyin scattering

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Abstract

Nonlinear optical phase conjugation by stimulated Brillouin scattering (SBS) has been the subject of extensive investigation.1 Pilipetskii etal.2 used a guided interaction geometry which clearly reproduced weak sidelobes in an image pattern that was attenuated by as much as 107 below the intensity of the central beam. Here we demonstrate that such a weak side beam in the input when supplied from a broadband'dye laser will have only a narrow spectral portion of its energy phase conjugated by SBS in the presence of a monochromatic central beam. Our apparatus, which employs the guided interaction geometry, constitutes a narrowband optical filter of peak transmissivity of ~0.2. Narrowband optical filtering with phase conjugation has been reported previously in experiments employing degenerate four-wave mixing.3-6

© 1983 Optical Society of America

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