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Low-noise amplification of ultraweak optical wave fronts in photorefractive Bi12SiO20

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Abstract

We propose and demonstrate a technique for suppressing the optical noise of the photorefractive amplifiers that exhibit a sharp gain resonance around an optimum pump-to-signal angle. The amplification of extremely weak images is achieved when the entrance face of the crystal is tilted with respect to the pump beam direction. In Bi12SiO20 subpicowatt optical signals are detected with this technique.

© 1991 Optical Society of America

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