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European Quantum Electronics Conference (EQEC)

Quantum amplification of images in a c.w. optical parametric amplifier

Sylvain Gigan, L. Lopez, Nicolas Treps, Claude Fabre, Agnès Maître

Published Jan 18, 2006• 0 citations
Publisher

Abstract

In the experiment presented, a transverse multimode OPO pumped either below or above threshold in order to observe spatial quantum properties are realized. In the continuous variable regime, transverse quantum effects (spatial correlations, spatial squeezing or noiseless amplification of images), are predicted be observable in such OPO/OPA. The key point in this experiment is the use of transverse degenerate cavities, having a non negligible spatial bandwidth, and allowing the resonance of many transverse modes.

DOI
10.1109/eqec.2005.1567422

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In the experiment presented, a transverse multimode OPO pumped either below or above threshold in order to observe spatial quantum properties are realized. In the continuous variable regime, transverse quantum effects (spatial correlations, spatial squeezing or noiseless amplification of images), are predicted be observable in such OPO/OPA. The key point in this experiment is the use of transverse degenerate cavities, having a non negligible spatial bandwidth, and allowing the resonance of many transverse modes.
The visibility and quality of optical images is ultimately limited not by diffraction but by the quantum noise affecting each pixel of a detector. Multimode non-classical states of light, characterized by spatial quantum correlation or local reduced quantum noise, permit in principle to go beyond the standard quantum limit and therefore to improve transverse optical resolution. It has been predicted that Optical Parametric Oscillators (OPO) operating simultaneously on many transverse modes are good candidates for generating multimode non-classical states of light. We perform an experiment showing that a c.w. confocal OPO above threshold emits such states. Below threshold, the OPO is turned to a multimode optical parametric amplifier.
We have experimentally shown that a degenerate optical parametric oscillator pumped by a cw laser, inserted in a cavity having degenerate transverse modes such as a hemiconfocal or confocal cavity, and operating below the oscillation threshold in the regime of phase sensitive amplification, is able to process input images of various shapes in the quantum regime. More precisely, when deamplified, the image is amplitude squeezed; when amplified, its two polarization components are intensity correlated at the quantum level. In addition, the amplification process of the images is shown to take place in the noiseless regime.
Summary form only given. We propose a scheme for a parametric image amplifier consisting of a parametric medium enclosed in a confocal resonator. In a ideal confocal resonator an infinite number of transverse modes, having a definite parity with respect to the inversion of the spatial transverse coordinates, are degenerate in frequency. As a consequence we show that a confocal parametric oscillator operating below threshold is capable of amplifying a coherent optical image as a whole, provided the input image has an even (odd) distribution in the transverse plane.