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Etude expérimentale de l'effet laser dans des microsphères de silice dopées avec des ions neodyme

Abstract : This thesis is devoted to microcavities based on the very high Q whispering gallery modes of silica microspheres, about 100μm in diameter. The electromagnetic field of these modes is guided along the sphere's surface by total internal reflection and confined in an equatonal nng with tranverse dimensions of the order of the wavelength. These guided modes have very low losses. They exhibit a remarkable combination of strong localization of the field in a small volume and very long storage times for the photons. These two properties render these microspheres ideal as optical resonators for non-linear optics as well as for cavity QED experiments After a general presentation of these resonances, the experimental techniques used to observe the resonances by laser spectroscopy are then described. The splitting of high-Q modes is also discussed and interpreted in terms of a coupled oscillator model. The practical realization of a microlaser with neodymium doped spheres is presented. The very low measured thresholds are found in agreement with an appropnate semi-classical model. A new set-up has been relized to operate with microspheres immersed in a superfluid helium bath. Very high Q's are preserved and laser emission has been observed at 2K. These results open the way to the search of a new lasing regime with a few ions coupled to a few photons.
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Submitted on : Tuesday, March 7, 2006 - 12:58:35 PM
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  • HAL Id : tel-00011781, version 1

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François Treussart. Etude expérimentale de l'effet laser dans des microsphères de silice dopées avec des ions neodyme. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1997. Français. ⟨tel-00011781⟩

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