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Power transfer by nearly degenerate two-wave mixing in a saturable dye-doped film

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Abstract

We analyze power transfer by nearly degenerate two-wave mixing (TWM) in a saturable absorbing medium by assuming a three-level model for the saturable absorbing medium. The theoretical results are compared with the experimental ones by using an erythrosin-B-doped polymer film as the saturable absorbing medium. Pump-intensity-dependent behavior of the TWM gain that is predicted by the theory was experimentally verified with this dye-doped film. The saturation intensity Is and the detuning parameter δ of erythrosin B were estimated by the comparison of the theory and the experiment: Is ≈ 1.6 W/cm2, δ ≈ 1.1. The theoretical curves calculated from these values are in good agreement with the experimental curves near resonance, whereas they disagree with the experimental results as the laser frequency shifts off resonance.

© 1991 Optical Society of America

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