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Theses

Réduction du bruit quantique de la lumière par une cavité bistable

Abstract : The aim of this thesis is to study quantum noise reduction in the electromagnetic field, both from the theoretical and experimental point of view. First, the calculation of noise spectra is derived using an "input-output" formalism, which describes the modification of the fluctuations of the field by the cavity and takes into account the fluctuations introduced by the non linear medium. This formalism is applied to a cavity containing a Kerr medium. This simple model gives us a figure of merit allowing us to classify different non linear media for their use in quantum noise reduction. A set of motionless atoms appears to be a very good medium. The detailed calculations of the noise spectra are performed within the two level atom model, using the "input-output" formalism. They confirm the conclusions of the simple model. The experimental part of this thesis is devoted to the realisation of a magneto-optical trap which gives us a cloud of nearly motionless cesium atoms as a non linear medium. The interaction of these atoms with an optical cavity gives us two results. First, we obtain a laser oscillation due to a Raman gain in the trapped atoms. Second, we observe optical bistability and instabilities. The last part of this thesis considers the difficulties of measuring the quantum noise of light and gives preliminary results concerning the noise in the light after having interacted with the bistable cavity.
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Submitted on : Thursday, March 9, 2006 - 1:03:57 PM
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  • HAL Id : tel-00011884, version 1

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Laurent Hilico. Réduction du bruit quantique de la lumière par une cavité bistable. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1992. Français. ⟨tel-00011884⟩

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