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Développement de cavités Fabry-Perot ultra-stables pour références de fréquence optique de nouvelle génération

Abstract : The work described in this document deals with optical frequency references, or ultrastable lasers. They are obtained from the frequency locking of a laser on a high finesse Fabry-Perot cavity. A first laser is stabilized on a commercial ULE Fabry-Perot cavity and exhibits a 1:9 x10-15 fractional frequency instability at 1 s. A femtosecond laser is phased lock to this ultrastable laser and allows generating an ultra-pure microwave signal. At 10 GHz, the signal exhibits a -104 dBc/Hz phase noise at 1 Hz. In a second project, we design a 25 mm ultra-compact cavity. Extensive finite element modeling led to a new spacer geometry, with simulated acceleration sensitivities below 10-12=(m=s2) in all directions. A compact vacuum chamber with embedded optical set-up has been developed to reduce the size of the system. Finally, a cryogenic silicon cavity has been designed. It will be cooled down to 17 K. At this temperature, its thermal noise would limit its fractional frequency instability to3 x 10-17. A low vibration cryogenerator is used to reach this temperature. Finite element modeling led to 4:5x 10-12=(m=s2) acceleration sensitivity.
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Submitted on : Wednesday, February 8, 2017 - 11:15:33 AM
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  • HAL Id : tel-01461475, version 1

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Alexandre Didier. Développement de cavités Fabry-Perot ultra-stables pour références de fréquence optique de nouvelle génération. Optique [physics.optics]. Université de Franche-Comté, 2016. Français. ⟨NNT : 2016BESA2016⟩. ⟨tel-01461475⟩

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