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Very high single-pass two-beam coupling gain at 647 nm under conditions of induced transparency in Rh: doped BaTiO 3

M. Kaczmarek, Robert W. Eason, M. H. Garrett, Daniel Rytz

Published Jan 1, 1995• 0 citations
OpenAlex

Abstract

Two-beam coupling gain has been measured in Rh:doped BaTiO3 yielding a value of the order of 20,000. We believe that this is the highest beam coupling gain reported so far. Rh-doped BaTiO3 exhibits very strong intensity-dependent absorption, and this effect is considered when discussing experimental results.

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Very high single-pass two-beam coupling gain at 647 nm under conditions of induced transparency in Rh: doped BaTiO3

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Journal of the Optical Society of America B•Sep 1, 1992•18 citations
Low noise image amplification owing to contradirectional two-wave mixing (CTWM) is proposed and demonstrated in Rh-doped BaTiO 3 crystal. Comparing with the conventional forward two-wave mixing scheme, an enhancement of signal-to-noise ratio in the order of 10 3 is obtained. The theoretical analyses are presented and give a reasonable explanation for the experimental results. The further discussion shows that CTWM scheme can also reduce the influence of the crystal absorption and crystal size on the two-wave mixing process to rise the signal beam gain.
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).