{"id":11775,"date":"2025-11-17T15:39:28","date_gmt":"2025-11-17T14:39:28","guid":{"rendered":"https:\/\/www.institut-foton.eu\/?p=11775"},"modified":"2025-12-04T07:56:07","modified_gmt":"2025-12-04T06:56:07","slug":"these-ronan-kervazo-10-12-2025","status":"publish","type":"post","link":"https:\/\/www.institut-foton.eu\/en\/these-ronan-kervazo-10-12-2025\/","title":{"rendered":"Th\u00e8se – Ronan KERVAZO – 10\/12\/2025"},"content":{"rendered":"\n

L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat :<\/strong><\/p>\n\n\n\n

<\/p>\n\n\n\n

D\u00e9veloppement de la photonique int\u00e9gr\u00e9e \u00e0 base d\u2019Al2<\/sub>O3<\/sub> pour l\u2018affinement spectral de diodes laser dans le bleu et le proche ultraviolet<\/em><\/strong><\/p>\n\n\n\n

Ronan Kervazo<\/p>\n\n\n\n

sous la direction de Jo\u00ebl Charrier, Lo\u00efc Bodiou et St\u00e9phane Trebaol<\/p>\n\n\n\n

Cette soutenance publique aura lieu le mercredi 10 d\u00e9cembre 2025 \u00e0 14h00 \u00e0 l\u2019Enssat en salle 020G.<\/strong><\/p>\n\n\n\n

Assister \u00e0 la soutenance par Zoom :<\/p>\n\n\n\n

https:\/\/univ-rennes1-fr.zoom.us\/j\/95951049334<\/a>
ID de r\u00e9union: 959 5104 9334
Code secret: 292235<\/p>\n\n\n\n

Rapporteurs avant soutenance <\/strong>:<\/p>\n\n\n\n

Sophie Bouchoule Directrice de Recherche, C2N, Universit\u00e9 Paris-Saclay<\/p>\n\n\n\n

Nicolas Le Thomas Professeur des Universit\u00e9s, IMEC, Universit\u00e9 de Gand<\/p>\n\n\n\n

Composition du Jury :<\/strong>
Examinateurs : Christelle Monat Professeure des Universit\u00e9s, INL, Ecole Centrale Lyon<\/p>\n\n\n\n

Jes\u00fas Z\u00fa\u00f1iga P\u00e9rez Directeur de Recherche, Majulab\/CRHEA, SPMS Singapour<\/p>\n\n\n\n

Dir. de th\u00e8se : Jo\u00ebl Charrier Professeur des Universit\u00e9s, Institut Foton, Universit\u00e9 de Rennes
Encadrants : Lo\u00efc Bodiou Professeur des Universit\u00e9s, Institut Foton, Universit\u00e9 de Rennes<\/p>\n\n\n\n

St\u00e9phane Trebaol Ma\u00eetre de Conf\u00e9rences, Institut Foton, Universit\u00e9 de Rennes<\/p>\n\n\n\n

R\u00e9sum\u00e9 :<\/em><\/p>\n\n\n\n


Ces derni\u00e8res ann\u00e9es, un int\u00e9r\u00eat scientifique croissant s’est manifest\u00e9 pour le d\u00e9veloppement de circuits photoniques int\u00e9gr\u00e9s dans la gamme du visible et proche ultraviolet (UV) pour adresser des applications telles que la d\u00e9tection sous-marine, l\u2019optog\u00e9n\u00e9tique ou encore celle li\u00e9es \u00e0 la quantique. Elles n\u00e9cessitent \u00e9galement des sources lasers monomodes compactes \u00e0 faible largeur de raie pouvant \u00eatre obtenues en exploitant le principe de la contre-r\u00e9action optique. La conception de fonctions de filtrage int\u00e9gr\u00e9es est donc n\u00e9cessaire pour d\u00e9velopper ce type de sources compactes. Ces fonctions doivent \u00eatre fabriqu\u00e9es \u00e0 partir de mat\u00e9riaux transparents dans la gamme d\u2019\u00e9tude. L\u2019oxyde d\u2019aluminium pr\u00e9sente un grand potentiel pour la conception de tels circuits gr\u00e2ce notamment \u00e0 sa large fen\u00eatre de transparence allant du proche ultraviolet au moyen infrarouge. Ce travail est d\u00e9di\u00e9 au d\u00e9veloppement de fonctions optiques int\u00e9gr\u00e9es pour le bleu et le proche-UV \u00e0 partir d\u2019oxyde d\u2019aluminium. Les circuits optiques int\u00e9gr\u00e9s sont d\u2019abord con\u00e7us par simulation, fabriqu\u00e9s par un intervenant ext\u00e9rieur dans le cadre d\u2019une collaboration, puis caract\u00e9ris\u00e9s gr\u00e2ce \u00e0 un banc optique adapt\u00e9 pour la gamme spectrale d\u2019\u00e9tude. Des composants tels que des interf\u00e9rom\u00e8tres multimodes ou des micro-r\u00e9sonateurs en anneau sont pr\u00e9sent\u00e9s. Le d\u00e9veloppement d\u2019un syst\u00e8me de contre-r\u00e9action bas\u00e9 sur une diode int\u00e9gr\u00e9e et un r\u00e9seau de Bragg fibr\u00e9 est \u00e9galement \u00e9tudi\u00e9 et a permis d\u2019affiner spectralement le mode principal de la diode.<\/p>\n\n\n\n

Development of Al<\/strong>2<\/strong><\/sub>O<\/strong>3<\/strong><\/sub>-based integrated photonics for spectral narrowing of laser diodes in the blue and near-ultraviolet spectral ranges<\/strong><\/p>\n\n\n\n

Abstract:<\/em><\/p>\n\n\n\n

In recent years, scientific interest has increasingly focused on the development of photonic integrated circuits operating in the visible and near-ultraviolet (UV) spectral ranges, driven by applications such as underwater communication, optogenetics, and quantum technologies. These applications also require compact, single-mode laser sources with narrow linewidths, which can be achieved by exploiting the principle of optical feedback. The design of integrated filtering functions is therefore essential for the realization of such compact sources. These functions must be fabricated from materials that are transparent within the wavelength range of interest. Aluminum oxide (alumina) shows great potential for the design of such circuits, notably due to its wide transparency window extending from the near-ultraviolet to the mid-infrared. This work focuses on the development of integrated optical functions for the blue and near-UV spectral regions using aluminum oxide. The integrated optical circuits are first designed through numerical simulations, then fabricated through a collaborative effort with an external partner, and finally characterized using an optical setup specifically adapted to the spectral range under study. Components such as multimode interferometers and ring microresonators are presented. The development of an optical feedback system based on an integrated diode and a fiber Bragg grating is also described, enabling laser linewidth narrowing.<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat : D\u00e9veloppement de la photonique int\u00e9gr\u00e9e \u00e0 base d\u2019Al2O3 pour l\u2018affinement spectral de diodes laser dans le bleu et le proche ultraviolet Ronan Kervazo sous la direction<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[37,9],"tags":[111],"class_list":["post-11775","post","type-post","status-publish","format-standard","hentry","category-agenda","category-non-classe","tag-departement-sp"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["fr","en"],"languages":{"fr":{"title":true,"content":true,"excerpt":false},"en":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11775","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\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/comments?post=11775"}],"version-history":[{"count":2,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11775\/revisions"}],"predecessor-version":[{"id":11787,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11775\/revisions\/11787"}],"wp:attachment":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media?parent=11775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/categories?post=11775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/tags?post=11775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}