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Amplification paramétrique d'images en cavité : Effets classiques et quantiques

Abstract : This thesis studies image
amplification by a parametric process. Performing this
amplification continuously requires placing the parametric medium
inside an optical cavity. Theoretically, this amplification is
noiseless and produces non-classical states of light.

First, we study classically the propagation of an image through a
paraxial system, and transverse degenerate cavities. We develop a
formalism to understand the transmission of an image through any
paraxial cavity. We illustrate this formalism by studying
theoretically and experimentally a particular cavity: the
semi-confocal cavity.

In a theoretical part we then focus on some particularities of
image amplification. we find that below threshold, the optical
parametric amplifier in a cavity, which is well-known to produce
squeezed vacuum, can also amplify a weak injected signal. We show
that, due to coupling to the pump noise, there is extra noise
added to the amplified signal during the amplification process. We
also study from a quantum point a view the transverse multimode
behaviour of the optical parametric amplifier in a semi-confocal

Finally, in the experimental part we study the behaviour of the
confocal optical parametric oscillator above threshold and we
prove that it produces multimode non-classical beams. We then show
that it is possible to amplify a signal in a phase-sensitive
configuration in this cavity below threshold. In a second
experiment using a more stable dual-cavity semi-confocal
configuration, we demonstrate the first multimode parametric
amplification of an optical image.
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Contributor : Sylvain Gigan <>
Submitted on : Tuesday, November 16, 2004 - 5:24:34 PM
Last modification on : Thursday, December 10, 2020 - 12:37:07 PM
Long-term archiving on: : Monday, September 20, 2010 - 12:01:21 PM


  • HAL Id : tel-00007425, version 2


Sylvain Gigan. Amplification paramétrique d'images en cavité : Effets classiques et quantiques. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00007425v2⟩



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