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Etudes de la pression de radiation dans les interféromètres utilisés pour la détection des ondes gravitationnelles

Abstract : The Virgo detector is a Michelson interferometer with 3 km Fabry Perot cavities in the arms and using the power recycling technique. The main aim is the direct detection of gravitational waves emitted by astrophysical sources. The injection system is constituted essentially by a triangular 144 m long cavity with the middle mirror suspended called the Mode Cleaner, capable of selecting the TEM00 mode only. The suspended mirror is very light (360g), which can make it sensitive to the photon pressure. I developed some simulation codes for a
triangular cavity with all controls identical to a real Virgo mode cleaner. These codes can be used for other studies.
The first part of this thesis is dedicated to studying the effects of the radiation pressure on the mode cleaner for the lock acquisition, the optical angular spring etc.
In the second part, I made the same simulation for studying the effect of the radiation pressure in 3 km long Virgo cavities, essentially on the optical angular spring, which can make problems for the automatic alignment on Virgo.
Finally, I describe my participation to the Virgo commissioning, which primarily consists in working on control systems for the system of laser beam injection and their optimization.
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https://tel.archives-ouvertes.fr/tel-00175254
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Submitted on : Thursday, September 27, 2007 - 1:50:49 PM
Last modification on : Monday, October 12, 2020 - 11:10:13 AM
Long-term archiving on: : Thursday, April 8, 2010 - 10:15:57 PM

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Salem Hebri. Etudes de la pression de radiation dans les interféromètres utilisés pour la détection des ondes gravitationnelles. Astrophysique [astro-ph]. Université Nice Sophia Antipolis, 2007. Français. ⟨tel-00175254⟩

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