Abstract

We describe a pulse readout technique for high gain and a high signal-to-noise ratio (SNR) in signal beam amplification by two-beam coupling in a photorefractive BaTiO₃ crystal. The basic idea behind the technique is the formation of photorefractive gratings using a low-intensity pump beam and subsequent readout of this grating with a strong pulse for a duration that is less than the time constant for noise development or beam fanning. Large values (~11,000) of the signal beam gain and SNR’s of ~1300 are achieved. A noise-free image amplification is the main achievement of this technique.

© 1991 Optical Society of America

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