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Theses

Amplification paramétrique, sans bruit, continue, d'images en cavité

Abstract : This thesis studies both theoretically and experimentally continuous images amplification
thanks to an optical parametric oscillator.
First, we study classically the properties of special optical cavities called transverse degenerate
cavities. We develop a formalism to understand the transmission of an image through
any paraxial cavity. We illustrate this formalism by studying a particular cavity: the semiconfocal
cavity. Then, we study the transmission and the second harmonic generation of an
image trough a perfect imaging cavity, the self imaging cavity.
Second, we investigate theoretically the spatial features of quantum noise generated by an
OPO below threshold. The effect of the finite size of the non-linear crystal on the squeezed
vacuum using a confocal cavity is investigated. This study is extended to a self-imaging cavity,
showing the possibility of local EPR beams generation.
We then focus on some particularities of image amplification. We built an OPO model
as close as possible to the experiment. The features of the cavity are optimized for noiseless
amplification.
Finally, in an experimental part we study the amplification of images thanks to a transverse
degenerate OPO below threshold. The study is performed with an hemi-confocal cavity
with a type II crystal and a confocal one with a type I crystal. The quantum feature of
the images is proved. The noise factor of the amplifier is measured, proving a ”noiseless”
operation.
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https://tel.archives-ouvertes.fr/tel-00130058
Contributor : Laurent Lopez <>
Submitted on : Thursday, February 8, 2007 - 10:43:56 PM
Last modification on : Monday, December 14, 2020 - 9:49:21 AM
Long-term archiving on: : Wednesday, April 7, 2010 - 2:43:04 AM

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  • HAL Id : tel-00130058, version 1

Citation

Laurent Lopez. Amplification paramétrique, sans bruit, continue, d'images en cavité. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00130058⟩

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