Formation “Tenue au flux laser des composants optiques” · Advent of fs lasers has open new...

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Formation “Tenue au flux laser des composants optiques”

Transcript of Formation “Tenue au flux laser des composants optiques” · Advent of fs lasers has open new...

Page 1: Formation “Tenue au flux laser des composants optiques” · Advent of fs lasers has open new opportunities and research fields for scientific, industrial and medical applications.

Formation “Tenue au flux laser des composants optiques”

Page 2: Formation “Tenue au flux laser des composants optiques” · Advent of fs lasers has open new opportunities and research fields for scientific, industrial and medical applications.

Programme Jour Heure Intitulé Formateur

lundi 1er juillet

10h00-10h30 Accueil 10h30-11h00 Introduction à la formation L. Gallais 11h00-12h00 Interaction laser matière en régime ultracourt O. Uteza 12h00-13h45 Repas 14h00-15h00 Physique de l'endommagement nanoseconde L. Lamaignère 15h00-17h00 TP1

mardi 2 juillet

9h00-10h00 Cristaux non-linéaires F. Wagner 10h00-12h00 TP 2 12h00-13h30 Repas 13h45-15h45 TP3 16h00-17h00 Métrologie de l’endommagement L. Lamaignère 17h00-18h00 Couches minces optiques L. Gallais

mercredi 3 juillet

9h00-11h00 TP4 11h00-12h00 Matériaux, surfaçage, nettoyage P. Cormont 12h30-14h00 Repas 14h00-15h00 Posts-traitements pour améliorer la TFL P. Cormont 15h00-16h00 Initiation par des défauts et traitements statistiques F. Wagner 16h00-16h30 Bilan et discussions

Liste des TP : Mesure de TFL en régime fs Mesure de TFL en régime ns Caractérisation d'une impulsion suivant norme ISO Caractérisation d'un dommage et réparation

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Organisation : hotel

● Hotel IBIS

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Organisation : repas

● Le midi : Les Terrasses de Saint Mitre ● Le soir : O’Zen

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Organisation : transport

● Metro 1 : Colbert – La Rose + Bus 3 (arrêt IUT de St Jérôme)

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Laser damage Irreversible modification of a material submitted to laser irradiation Result of the coupling of laser light with material

– Energy Absorption – Transfer – Dissipation

Subject is studied since the advent of lasers*,**

*M. Hercher, “Laser-induced damage in transparent media”, JOSA 54 563 (1964). **C. Giuliano, “Laser-induced damage to transparent dielectric materials”, JOSA 54 1400 (1964).

Présentateur
Commentaires de présentation
Coupling of the laser energy by absorption, then transfer in the material and relaxation of the excess of energy that can lead to physical degradation of the material (melting, cracks,...) Has been studied since the advent of lasers 1964 (first laser in 60) Long history of work on that topic Increasing publication on that topic Excluding conf proceedings, and laser damage in medical applications (lot of things) Very dynamic subject High number of new lasers and big projects New teams working on that topic (chinese)
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Introduction Advent of fs lasers has open new opportunities and research

fields for scientific, industrial and medical applications. Peak power and energy in laser systems is limited by the

damage threshold of the optics in the laser chain Examples of current topics where optical resistance is an issue:

– High power commercial laser systems – Lasers for spatial applications – Fusion class lasers : LMJ, NIF, HIPER – Lasers for high-field physics : ELI, Apollon, Vulcan... – ...

Commercial TW laser (Amplitude)

Pulse compression grating for PetaWatt class laser (Apollon)

ChemCam experiment on CURIOSITY (NASA/CNES)

Présentateur
Commentaires de présentation
1/ seen in the previous talk Also a lot of industrial applications for material processing, medical applications such as the eye surgery etc... 2/ 3/Work with lasers, particulary medium power lasers, perhaps you have encouterd some damage on your optics. Commercial lasers: lifetime and reliability of the system / cost. Very complex optical systems with a lot of different components 200TW T Fusion class laser: NIF, LMJ = ns lasers with MJ output energy to reach fusion ignition of a fule pellet Only one or few shots per day but the cost of each of the optics is very high HIPER → ignition of target with a PW fs laser pulse and compression with ns pulses Size of the optics link to the damage thresold limitation: reduce the energy density on the optics Other big lasers are built Lot of different countries Grating: lines = 1µm LIBS → experiments in IF Part of the laser can not be replaced and enven if moderate energy is requuired, system is very compact and same issues as in very big laser (intensity on the optics is the same) Same value of W/m² on the optics
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Introduction Ce sujet particulier fait l'objet

d'études depuis les années 60...

Base de connaissances très importante sur le sujet*

Evolution permanente des technologies + ’émergence de nouvelles applications

=> renouvellement des sujets de recherche sur la thématique

Nombre de publications correspondant `a la requête ”laser damage” dans le titre (base de données WebSpiris)

*Notamment les recueils du Laser Damage Symposium (Boulder, Colorado), 1968-2012

Présentateur
Commentaires de présentation
Début = années 60 Émergence des fs, ps +chinois Recherche dans l'abstract = 1500
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Introduction Some results of laser interaction with optical components... Understanding the mechanisms responsible for optical damage

may allow higher-damage-threshold optics to be designed and manufactured for laser systems

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Introduction Objectifs de la formation

– Introduction aux mécanismes physiques responsables de la dégradation des optiques

– Connaître les effets d'une irradiation laser sur une optique en fonction du type de matériau et des paramètres du laser

– Évaluer les limitations de son application – Identifier les problèmes d'endommagement laser rencontrés – Connaître les matériaux et composants résistants aux flux laser – Savoir mesurer et interpréter un seuil de tenue au flux laser – Être informé des activités de recherche dans ce domaine

Présentateur
Commentaires de présentation
Is it possible? What are the limits?
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ILM team of the Institut Fresnel Laser Matter Interactions

– Experimental and theoretical work to study the physics of laser damage phenomena

– Progress in the design, manufacturing of optical components for high power applications

– Laser processing

Présentateur
Commentaires de présentation
The Laser Matter Interaction group of the Institut Fresnel dedicates his research work to experimental and fundamental studies of high power laser/matter interactions applied to the optical. The group develops experiments, models and numerical tools for the study of laser damage effects in optical materials and systems, and the resistance improvement of laser materials. Different specific high power laser benchs operating in the continuous, nanosecond and femtosecond regime have been developped in the group for these studies.The group collaborates with institutions, space agencies laboratories and companies that design high power laser systems of manufacture high power laser optical components. The group is composed of 12 members, including 5 Teaching Researchers (3 Professor and 2 Associate Professors), 1 post doctorate, 1 engineer, 3 PhD students and Master students. Process to repair damaged optics
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List of phD students on laser damage issues

P. Volto – 1998 : laser damage in optical thin films L.Gallais – 2002 : laser damage metrology and statistical models A.During – 2002 : photothermal microscopy O. Thomas – 2004 : ns non-linear effects F. Billard – 2005 : fs/ps non-linear effects B. Bertussi – 2005 : KDP crystals H. Krol – 2006 : thin films for Mid IR J. Capoulade – 2008 : KDP and thin films H. Hildenbrand – 2008 : Non-linear crystals (RTP, BBO, ...) A. Ciapponi – 2009 : luminescence for laser damage studies B. Bussière – 2009 : Ti:Saphire crystals S. Reyné – 2011 : multi-wavelength effects in KDP crystals B. Mangote – 2011 : sub-ps laser damage of optical thin films X. Fu – 2012 : ns laser damage resistance of binary oxide films and DOE

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Publications 57 peer reviewed publications in the field of laser damage research >100 conference proceedings 2 patents 13 invited talks in international conferences

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Collaborations Present

– REOSC (SAFRAN), – CEA, CNES, ESA – Laser Zentrum Hannover, Laser Research Center (Vilnius University) – ICR, IM2NP, LOA, LP3

Past – Amplitude, CILAS, Cristal Laser, SESO, SILIOS, Thales laser

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Present subjects of interest Laser damage of non-linear crystals Laser damage of optical thin films in ns, ps and fs regime Laser damage of diffractive optical elements Laser damage of optics for space applications Laser damage mitigation processing Modelisation of laser matter interaction from CW irradiation to fs Development of experimental tools for the characterization of

optical components Laser processing of thin films