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DEVELOPPEMENT DE SOURCES LASERS SOLIDES AGILES ULTRA-STABLES POUR LA MANIPULATION COHERENTE DE SYSTEMES ATOMIQUES. APPLICATIONS AU TRAITEMENT OPTIQUE DE SIGNAUX RADIOFREQUENCES ET A L'INFORMATION QUANTIQUE.

Abstract : In this thesis, we take advantage of the spectral properties of rare-earth ion-doped crystals to perform time-to-frequency Fourier transform operations. We introduce the first experimental demonstration of coherent processing of radiofrequency (RF) signals over a wide bandwidth. Our system is based on an excitation sequence using frequency-swept pulses, deriving from photon echoes. Thanks to this algorithm, the RF signal spectrum is displayed in the time domain. Experimentally, we measured impressive performances in an Er:YSO crystal, using an optical transition in the telecommunication window. Indeed, the instantaneous bandwidth reaches 1.5 GHz, together with 24,000 independent frequency channels. The resolution can be as low as 50 kHz, and the dynamic range of the process is 32 dB. These results are obtained thanks to the development of a specific laser source, whose frequency can be tuned over several GHz in few µs. A servo loop ensures an excellent precision of the frequency scans. Other laser sources have also been built up: one uses waveguide structures; another one is frequency-locked on an optical reference cavity, in order to reach a sub-kHz emission linewidth. We also introduce a first study of photon echoes generated in an amplifying Er:YSO crystal. This way, the energy efficiency of the process is increased. New dephasing mechanisms occurring during the photon echo stimulation are highlighted.
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https://tel.archives-ouvertes.fr/tel-00097762
Contributor : Vincent Crozatier <>
Submitted on : Friday, September 22, 2006 - 11:51:27 AM
Last modification on : Monday, February 15, 2021 - 10:37:39 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 1:07:38 AM

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Vincent Crozatier. DEVELOPPEMENT DE SOURCES LASERS SOLIDES AGILES ULTRA-STABLES POUR LA MANIPULATION COHERENTE DE SYSTEMES ATOMIQUES. APPLICATIONS AU TRAITEMENT OPTIQUE DE SIGNAUX RADIOFREQUENCES ET A L'INFORMATION QUANTIQUE.. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00097762⟩

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