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Improving quantum-noise reduction with spatially multimode squeezed light

Abstract : We consider the squeezed vacuum state emitted by a degenerate optical parametric oscillator below threshold. We show, by using a confocal cavity and an appropriate matching lens, that the observed level of squeezing can become largely independent of the spatial intensity configuration of the local-oscillator field.
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Luigi A. Lugiato, Philippe Grangier. Improving quantum-noise reduction with spatially multimode squeezed light. Journal of the Optical Society of America B, Optical Society of America, 1997, 14 (2), pp.225-231. ⟨10.1364/JOSAB.14.000225⟩. ⟨hal-00871013⟩

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