{"id":4746,"date":"2023-10-13T11:59:34","date_gmt":"2023-10-13T09:59:34","guid":{"rendered":"https:\/\/www.institut-foton.eu\/?p=4746"},"modified":"2025-07-17T11:08:15","modified_gmt":"2025-07-17T09:08:15","slug":"detection-dondes-gravitationnelles","status":"publish","type":"post","link":"https:\/\/www.institut-foton.eu\/en\/detection-dondes-gravitationnelles\/","title":{"rendered":"Detection of gravitational waves"},"content":{"rendered":"\n

\u2b9e<\/strong><\/code> D\u00e9partement DOP<\/a> \u2b9e<\/strong><\/code> Th\u00e9matiques de recherche<\/a> \u2b9e<\/strong><\/code> Activit\u00e9 \u00ab\u202fPolarim\u00e9trie, senseurs et imagerie\u202f\u00bb<\/a> \u2b9e<\/strong><\/code><\/p>\n\n\n\n\n\n\n

Presentation<\/h2>\n\n\n\n

The Virgo and LIGO interferometers have been observing the vibrations of space-time predicted by general relativity since 2015. The observation of the last spiraling phases before coalescence of two black holes or two neutron stars has opened a new window on the universe . The DOP team is involved in the instrumentation necessary for these detections.<\/p>\n\n\n\n

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L\u2019interf\u00e9rom\u00e8tre Virgo<\/a>, non loin de Pise, en Italie<\/figcaption><\/figure>\n\n\n\n

Parametric instabilities<\/h3>\n\n\n\n

The impact of the background noise of gravitational interferometers decreases when the laser power is increased. However, above a threshold, the optical power can \u201cpump out\u201d the mechanical resonance of the mirrors and an optical mode that does not contribute to the detected signal. We have developed a model that takes into account real noise sources, to better understand how to avoid these instabilities or even exploit them to improve the instrument efficiency.<\/p>\n\n\n\n

Profile of the mirrors of the resonant optical cavities<\/h3>\n\n\n\n

The reflecting surfaces of mirrors do not have perfectly cylindrical profiles: very slight deviations from the ideal profile can degrade the performance of the instrument. We want to help specify defects of the mirrors with two-dimensional prolate functions, more suitable for finite surfaces.<\/p>\n\n\n\n

Research staff involved<\/h2>\n\n\n\n
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Les interf\u00e9rom\u00e8tres Virgo et LIGO observent les vibrations de l\u2019espace-temps pr\u00e9dites par la relativit\u00e9 g\u00e9n\u00e9rale depuis 2015. L\u2019observation des derni\u00e8res phases spiralantes avant coalescence de deux trous noirs ou de deux \u00e9toiles \u00e0 neutrons a ouvert une nouvelle fen\u00eatre sur l\u2019univers. L\u2019\u00e9quipe DOP intervient sur des \u00e9l\u00e9ments relatifs \u00e0 l\u2019instrumentation n\u00e9cessaire pour ces d\u00e9tections.<\/p>\n","protected":false},"author":3,"featured_media":4747,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[61],"tags":[91,30,108,32,84],"class_list":["post-4746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-activites","tag-capteurs-et-applications","tag-axe1","tag-departement-dop","tag-axe3","tag-polar-senseurs-imagerie"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["fr","en"],"languages":{"fr":{"title":true,"content":true,"excerpt":true},"en":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/4746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/comments?post=4746"}],"version-history":[{"count":18,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/4746\/revisions"}],"predecessor-version":[{"id":11231,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/4746\/revisions\/11231"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media\/4747"}],"wp:attachment":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media?parent=4746"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/categories?post=4746"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/tags?post=4746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}