FR3081737B1 - Procedes et systemes pour la generation d'impulsions laser de forte puissance crete - Google Patents

Procedes et systemes pour la generation d'impulsions laser de forte puissance crete Download PDF

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Publication number
FR3081737B1
FR3081737B1 FR1854859A FR1854859A FR3081737B1 FR 3081737 B1 FR3081737 B1 FR 3081737B1 FR 1854859 A FR1854859 A FR 1854859A FR 1854859 A FR1854859 A FR 1854859A FR 3081737 B1 FR3081737 B1 FR 3081737B1
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Prior art keywords
laser pulses
power laser
crete
generation
systems
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FR1854859A
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English (en)
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FR3081737A1 (fr
Inventor
Guillaume Gorju
Adam Ayeb
Xavier Levecq
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Imagine Optic SA
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Imagine Optic SA
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Priority to FR1854859A priority Critical patent/FR3081737B1/fr
Priority to US16/972,479 priority patent/US20210268605A1/en
Priority to EP19731606.0A priority patent/EP3804052A1/fr
Priority to CN201980052366.4A priority patent/CN112544019A/zh
Priority to JP2020568266A priority patent/JP2021525969A/ja
Priority to PCT/EP2019/064219 priority patent/WO2019233899A1/fr
Publication of FR3081737A1 publication Critical patent/FR3081737A1/fr
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Publication of FR3081737B1 publication Critical patent/FR3081737B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094049—Guiding of the pump light
    • H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2308—Amplifier arrangements, e.g. MOPA
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/03—Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/20—Lasers with a special output beam profile or cross-section, e.g. non-Gaussian
    • H01S2301/206—Top hat profile
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0602—Crystal lasers or glass lasers
    • H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094069—Multi-mode pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094076—Pulsed or modulated pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lasers (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

La présente description concerne selon un aspect un système (10) de génération d'impulsions laser de forte puissance crête comprenant au moins une première source lumineuse (101) pour l'émission de premières impulsions laser (IL), un dispositif fibré (110) pour le transport desdites premières impulsions laser, comprenant au moins une première fibre multimode avec un cœur unique agencé pour recevoir lesdites premières impulsions laser, et au moins un premier amplificateur optique (120) agencé en sortie dudit dispositif fibré pour l'amplification optique desdites premières impulsions laser afin de former lesdites impulsions laser de forte puissance crête.
FR1854859A 2018-06-05 2018-06-05 Procedes et systemes pour la generation d'impulsions laser de forte puissance crete Active FR3081737B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR1854859A FR3081737B1 (fr) 2018-06-05 2018-06-05 Procedes et systemes pour la generation d'impulsions laser de forte puissance crete
US16/972,479 US20210268605A1 (en) 2018-06-05 2019-05-31 Methods and systems for generating high peak power laser pulses
EP19731606.0A EP3804052A1 (fr) 2018-06-05 2019-05-31 Procédés et systèmes pour la génération d'impulsions laser de forte puissance crête
CN201980052366.4A CN112544019A (zh) 2018-06-05 2019-05-31 用于产生高峰值功率激光脉冲的方法和系统
JP2020568266A JP2021525969A (ja) 2018-06-05 2019-05-31 高ピークパワーレーザパルス生成方法および高ピークパワーレーザパルス生成システム
PCT/EP2019/064219 WO2019233899A1 (fr) 2018-06-05 2019-05-31 Procédés et systèmes pour la génération d'impulsions laser de forte puissance crête

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1854859A FR3081737B1 (fr) 2018-06-05 2018-06-05 Procedes et systemes pour la generation d'impulsions laser de forte puissance crete
FR1854859 2018-06-05

Publications (2)

Publication Number Publication Date
FR3081737A1 FR3081737A1 (fr) 2019-12-06
FR3081737B1 true FR3081737B1 (fr) 2022-02-11

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FR1854859A Active FR3081737B1 (fr) 2018-06-05 2018-06-05 Procedes et systemes pour la generation d'impulsions laser de forte puissance crete

Country Status (6)

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US (1) US20210268605A1 (fr)
EP (1) EP3804052A1 (fr)
JP (1) JP2021525969A (fr)
CN (1) CN112544019A (fr)
FR (1) FR3081737B1 (fr)
WO (1) WO2019233899A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210305763A1 (en) * 2020-03-24 2021-09-30 David Stucker Composite fiber laser assembly
FR3113428B1 (fr) 2020-08-14 2022-08-19 Imagine Optic Procédés et systèmes pour la génération d’impulsions laser de forte puissance crête
WO2022149358A1 (fr) * 2021-01-06 2022-07-14 株式会社島津製作所 Dispositif laser, dispositif de communication optique sans fil sous-marin et dispositif d'usinage laser
CN117471720B (zh) * 2023-12-27 2024-04-09 武汉中科锐择光电科技有限公司 一种基于声光延时线的超短脉冲整形装置

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937421A (en) 1989-07-03 1990-06-26 General Electric Company Laser peening system and method
US6002102A (en) 1997-02-25 1999-12-14 Lsp Technologies, Inc. Hidden surface laser shock processing
US7042631B2 (en) * 2001-01-04 2006-05-09 Coherent Technologies, Inc. Power scalable optical systems for generating, transporting, and delivering high power, high quality, laser beams
US6818854B2 (en) 2001-09-14 2004-11-16 The Regents Of The University Of California Laser peening with fiber optic delivery
JP3807374B2 (ja) * 2003-01-31 2006-08-09 住友電気工業株式会社 一括多点ホモジナイズ光学系
ATE498928T1 (de) 2003-10-30 2011-03-15 Metal Improvement Company Llc Relay teleskop, laserverstärker, und laserschockbestrahlungsverfahren und dessen vorrichtung
US7110171B2 (en) * 2003-10-30 2006-09-19 Metal Improvement Company, Llc Relay telescope including baffle, and high power laser amplifier utilizing the same
US7630418B2 (en) * 2005-01-10 2009-12-08 Kresimir Franjic Laser system for generation of high-power sub-nanosecond pulses with controllable wavelength in 2-15 μm region
FR2884652B1 (fr) * 2005-04-19 2009-07-10 Femlight Sa Dispositif de generation d'impulsions laser amplifiees par fibres optiques a couches photoniques
US7733922B1 (en) * 2007-09-28 2010-06-08 Deep Photonics Corporation Method and apparatus for fast pulse harmonic fiber laser
US9285541B2 (en) * 2008-08-21 2016-03-15 Nlight Photonics Corporation UV-green converting fiber laser using active tapers
CA2743648C (fr) * 2008-11-21 2014-11-04 Institut National D'optique Oscillateur laser a fibre a impulsions selectif de facon spectrale
US8817827B2 (en) * 2011-08-17 2014-08-26 Veralas, Inc. Ultraviolet fiber laser system
US9172208B1 (en) * 2012-02-21 2015-10-27 Lawrence Livermore National Security, Llc Raman beam combining for laser brightness enhancement
CN103022867A (zh) * 2012-12-18 2013-04-03 中国人民解放军国防科学技术大学 一种高功率高效率的超连续谱光源
TW201448386A (zh) * 2013-04-02 2014-12-16 Eolite Systems 用於產生超短雷射脈衝的裝置和方法
EP3029860A1 (fr) * 2014-12-05 2016-06-08 Alcatel Lucent Système d'amplification optique
CN105958308A (zh) * 2016-07-03 2016-09-21 中国人民解放军国防科学技术大学 高功率啁啾脉冲放大短波红外相干超连续谱激光光源
US10228250B2 (en) * 2016-09-20 2019-03-12 The Board Of Trustees Of The Leland Stanford Junior University Optical system and method utilizing a laser-driven light source with white noise modulation
FR3081738B1 (fr) * 2018-06-05 2020-09-04 Imagine Optic Procedes et systemes pour la generation d'impulsions laser de forte puissance crete

Also Published As

Publication number Publication date
FR3081737A1 (fr) 2019-12-06
CN112544019A (zh) 2021-03-23
JP2021525969A (ja) 2021-09-27
WO2019233899A1 (fr) 2019-12-12
US20210268605A1 (en) 2021-09-02
EP3804052A1 (fr) 2021-04-14

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