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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Quantum noise reduction by beam coupling in photorefractive media

Mark E. Saffman

Published May 6, 1996• 0 citations
Publisher

Abstract

I propose a new approach to generation of sub-Poissonian twin beams. A perturbative analysis shows that frequency dependent redistribution of fluctuations between photorefractively coupled beams results in output beams with sub shot noise intensity correlations.
DOI
10.1117/12.239830

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The low-frequency intensity noise of high-quantum-efficiency lasers or light-emitting diodes (LED's) is dominated by the pump noise. By coupling two or more semiconductor lasers (or LED's) in series with a current source, the pump noise of the two lasers will be equal, and the intensity noise of the lasers will be highly correlated. It is shown that one may generate sub-Poissonian light by measuring the intensity fluctuations of one of the beams and feeding back (or forward) the information to regulate the other photon beam. The generation scheme is shown to have much in common with intensity-correlated twin beam generation from nondegenerate optical parametric oscillators.
The interaction of doubly resonant second harmonic generation and nondegenerate down-conversion in a cavity is shown to generate light with excellent noise suppression in two symmetrical dips moving away from zero frequency with increasing pump strength. This feature emerges not only in the amplitude noise of fundamental and second harmonic, but also in the single beam and the sum intensity fluctuation spectra of the twin beams produced by down-conversion, which makes this system a potentially useful source for quantum cryptography or optical quantum correlation experiments.