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Optics Letters

Very-high-gain single-pass two-beam coupling in blue Rh:BaTiO_3

Malgosia Kaczmarek, Robert W. Eason

Published Sep 15, 1995• 34 citations
Publisher

Abstract

Two-beam coupling has been studied at red and near-infrared wavelengths in blue Rh:BaTiO(3). High amplification, of the order of 20,000-37,000, of a weak signal beam has been measured. The effect of strong intensity-dependent transmission is considered when theoretical plots are fitted to the experimental data.
DOI
10.1364/ol.20.001850

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The buildup and the decay of photorefractive two-beam coupling are experimentally demonstrated to be strongly dependent on the intensity ratio of the two beams (signal-to-pump ratio). The experiment, done with a BaTiO3 crystal, shows good agreement with the theory of two-beam coupling in the depleted-pump regime. The deviation of the response behavior from the small-signal regime is seen for ratios as small as ∼10−5. These results are significant for applications of two-beam coupling as gain media, especially for the elimination of amplified noise (fanning).