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Conference on Lasers and Electro-Optics

Experimental demonstration of noiseless image amplification in a c.w. optical parametric oscillator

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

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We realize image amplification in the continuous wave regime within an optical parametric oscillator bellow threshold. We show that its noise figure is better than that of a classical amplifier, demonstrating its quantum multimode operation.
DOI
10.1109/cleo.2006.4629054

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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.
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 used a spatially broadband optical parametric amplifier for image amplification. In the phase-sensitive configuration of the amplifier, we observed noiseless amplification of input images. For a gain of $\ensuremath{\simeq}2.5$, we measured noise-figure values of ( $0.2\ifmmode\pm\else\textpm\fi{}0.6$) and ( $0.4\ifmmode\pm\else\textpm\fi{}0.5$) dB, respectively, for two amplifiers of different lengths. These experimental values agree with theory (for an ideal noiseless amplifier the noise figure is 0 dB) and are almost 2 dB lower than the quantum limit of an ideal phase-insensitive amplifier.