EP3804052A1 - Verfahren und systeme zur erzeugung von laserimpulsen mit hoher spitzenleistung - Google Patents
Verfahren und systeme zur erzeugung von laserimpulsen mit hoher spitzenleistungInfo
- Publication number
- EP3804052A1 EP3804052A1 EP19731606.0A EP19731606A EP3804052A1 EP 3804052 A1 EP3804052 A1 EP 3804052A1 EP 19731606 A EP19731606 A EP 19731606A EP 3804052 A1 EP3804052 A1 EP 3804052A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- pulses
- laser pulses
- fiber
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Classifications
-
- 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
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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
- H01S3/09—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
Definitions
- high peak power means laser pulses having a peak power of the order of 10 MW or greater. Such pulses are adapted, after focusing on surfaces of a few mm 2 , typically between 0.1 and 10 mm 2 , to the generation of laser shocks in a given material, for example for laser shot blasting, surface cleaning, ultrasound generation, spectroscopy, etc.
- the light beam formed by said first laser pulses and incident on said reflective surface or surfaces has dimensions smaller than the dimensions of the one or more reflecting surfaces.
- the pump light source comprises for example a laser diode or a laser diode assembly
- the laser shock causes a vaporization of the surface to be treated.
- the ejected atoms and ions are carried into excited energy levels and emit, by de-excitation, a spectrum consisting of atomic lines, whose wavelength makes it possible to identify the elements present and whose intensity is proportional to the concentration of the emitting atoms.
- ablation cleaning the plasma created on the surface under the effect of the radiation relaxes, thus causing a splitting and an expulsion of the soil without damaging the surface to be cleaned.
- the system 10 When the system 10 is used for example for laser shot peening purposes, it is possible to provide also for the formation of the confinement layer, a water nozzle 14 fed by a water tank and a pump 12 delivering water. the water at the nozzle 14 by means of a pipe 13.
- the water is not obligatory and the confinement layer can equally well be obtained thanks to a gel, a paint or a solid material transparent to the length of the water.
- wave pulses eg Quartz
- the confinement layer is also not useful in applications other than laser shot blasting.
- the applicant has shown that it may be advantageous in a high peak laser pulse generation system according to the present description to reduce the DSP so as to be, for a given fiber diameter and a given length of the fiber device, below the stimulated Brillouin backscattering threshold in the fiber device.
- FIG. 3A is based on the use of an acousto-optic modulator 33 (MAO, or AOM), using the acousto-optical effect to diffract and change the optical frequency of light by sound waves (generally close to radio frequencies).
- MAO acousto-optic modulator 33
- AOM acousto-optic modulator 33
- FIG. 3B Another arrangement for multiplying the lines of the first laser pulses is shown in FIG. 3B.
- the incident pulses on the rotating mirror 42 have, for example, a spectrum So centered on an optical frequency v 0 and with a given spectral finesse (curve 401).
- the curve 402 schematically indicates the spatial distribution of the intensity I (r) of an incident pulse (fine line) and the spatial distribution of the optical frequency v (r) (thick line).
- the spatial distribution of the optical frequency is constant, for example equal to v 0 .
- the light beam formed by the incident laser pulses on each reflecting surface has a diameter less than or equal to:
- the light pulses can be reflected on each of the reflecting faces of the polygon and it is possible to multiply the spectral spreading effect by Doppler effect.
- the spectrum of a line incident on the rotating reflecting device will undergo a widening due to the Doppler effect expressed as follows:
- the beam undergoes a scan during its duration of 20 ns equal to 115 prad, or about 2 times the diffraction limit. . This will help to minimize the contrast of the speckle.
- the methods presented above for the reduction of PSD are not exhaustive and can be combined.
- the profile Po represents the profile of the intensity of the laser pulses emitted by a laser source, for example of the Gaussian type.
- the applicant has shown that with a profile Pi type "top hat", as shown in FIG. 5A, the risk of overcurrents during propagation in the fiber device is reduced.
- the spatial shaping of the beam in the image plane of the optical system 52 corresponds to the spatial Fourier transform of the phase mask imposed by the DOE 51 convolved with the spatial Fourier transform of the spatial intensity distribution of the beam at the level of the beam. DOE.
- the phase mask imposed by the DOE 51 is calculated such that the result of this convolution forms a "top hat" intensity distribution, the diameter D of the beam being proportional to the focal length f of the optical system 52.
Landscapes
- 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)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Lasers (AREA)
- Optical Couplings Of Light Guides (AREA)
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 |
| PCT/EP2019/064219 WO2019233899A1 (fr) | 2018-06-05 | 2019-05-31 | Procédés et systèmes pour la génération d'impulsions laser de forte puissance crête |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3804052A1 true EP3804052A1 (de) | 2021-04-14 |
Family
ID=63407397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19731606.0A Pending EP3804052A1 (de) | 2018-06-05 | 2019-05-31 | Verfahren und systeme zur erzeugung von laserimpulsen mit hoher spitzenleistung |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20210268605A1 (de) |
| EP (1) | EP3804052A1 (de) |
| JP (1) | JP2021525969A (de) |
| CN (1) | CN112544019A (de) |
| FR (1) | FR3081737B1 (de) |
| WO (1) | WO2019233899A1 (de) |
Families Citing this family (4)
| 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 (ja) * | 2021-01-06 | 2022-07-14 | 株式会社島津製作所 | レーザ装置、水中光無線通信装置およびレーザ加工装置 |
| 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)
| 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 |
| US7110171B2 (en) * | 2003-10-30 | 2006-09-19 | Metal Improvement Company, Llc | Relay telescope including baffle, and high power laser amplifier utilizing the same |
| DE602004031401D1 (de) | 2003-10-30 | 2011-03-31 | L Livermore Nat Security Llc | Relay Teleskop, Laserverstärker, und Laserschockbestrahlungsverfahren und dessen Vorrichtung |
| 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 (en) * | 2008-11-21 | 2014-11-04 | Institut National D'optique | Spectrally tailored pulsed fiber laser oscillator |
| 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 |
| WO2014162209A2 (en) * | 2013-04-02 | 2014-10-09 | Eolite Systems | Apparatus and method for generating ultrashort laser pulses |
| EP3029860A1 (de) * | 2014-12-05 | 2016-06-08 | Alcatel Lucent | Optisches Verstärkungssystem |
| 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 |
-
2018
- 2018-06-05 FR FR1854859A patent/FR3081737B1/fr active Active
-
2019
- 2019-05-31 US US16/972,479 patent/US20210268605A1/en not_active Abandoned
- 2019-05-31 JP JP2020568266A patent/JP2021525969A/ja active Pending
- 2019-05-31 CN CN201980052366.4A patent/CN112544019A/zh active Pending
- 2019-05-31 WO PCT/EP2019/064219 patent/WO2019233899A1/fr unknown
- 2019-05-31 EP EP19731606.0A patent/EP3804052A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20210268605A1 (en) | 2021-09-02 |
| FR3081737B1 (fr) | 2022-02-11 |
| WO2019233899A1 (fr) | 2019-12-12 |
| CN112544019A (zh) | 2021-03-23 |
| FR3081737A1 (fr) | 2019-12-06 |
| JP2021525969A (ja) | 2021-09-27 |
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