WO1991001056A1 - Reseaux laser segmentes a diodes couplees par fibres - Google Patents

Reseaux laser segmentes a diodes couplees par fibres Download PDF

Info

Publication number
WO1991001056A1
WO1991001056A1 PCT/AU1990/000293 AU9000293W WO9101056A1 WO 1991001056 A1 WO1991001056 A1 WO 1991001056A1 AU 9000293 W AU9000293 W AU 9000293W WO 9101056 A1 WO9101056 A1 WO 9101056A1
Authority
WO
WIPO (PCT)
Prior art keywords
diode
output
fibre
phase
laser
Prior art date
Application number
PCT/AU1990/000293
Other languages
English (en)
Inventor
John Leonard Hughes
Original Assignee
Australian Electro Optics Pty. Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Australian Electro Optics Pty. Ltd. filed Critical Australian Electro Optics Pty. Ltd.
Publication of WO1991001056A1 publication Critical patent/WO1991001056A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06233—Controlling other output parameters than intensity or frequency
    • H01S5/06243—Controlling other output parameters than intensity or frequency controlling the position or direction of the emitted beam
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4031—Edge-emitting structures
    • H01S5/4062—Edge-emitting structures with an external cavity or using internal filters, e.g. Talbot filters
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4075—Beam steering

Definitions

  • This invention relates to a phase-locked, fibre coupled diode- fibre array laser consisting of groups of coherently phase-locked arrays emitting diffraction limited laser beams which are fibre 5 coupled to produce a larger diameter phase-locked laser beam, itself being diffraction limited.
  • the invention has applications in the industrial, medical, defence and mass entertainment fields.
  • Phase-locked, diode laser arrays are well known in the art.
  • each of the laser diodes is necessary to position each of the laser diodes within about ten microns (10-3 cms) of each other within the array so that they can be optically coupie ⁇ to each other, a process referred to as evanescent coupling of the diodes within the array.
  • evanescent coupling of the diodes within the array a process referred to as evanescent coupling of the diodes within the array.
  • the . size of the coherently phase-locked array is still limited in
  • the present invention overcomes the defects of prior art systems by limiting the cross-sectional area of the laser diode array on a given substrate so that each such diode array emits a diffraction limited laser beam which is fibre coupled to produce phase-locked diffraction limited laser beams which in turn combine together to form a phase-locked, diffraction limited laser output beam of the single, fibre end face aperture of said system.
  • groups of diode arrays they have to be ⁇ o separated for optimum cooling, but collectively coupled optically for optimum phase-locking, two contradictory requirements which are balanced in this invention.
  • a given array has to be of a size that provides good phase-locking resulting in a single iobed output beam and experience indicates
  • a 1 ,000 diode array would have a circular cross-sectional area of about 300 microns (3 x 10-2 cms) in diameter.
  • Diode lasers provide a most effective method of converting electrical energy into laser beam energy with 25 conversion efficiencies in excess of 30% being achievable in practice.
  • Diode lasers are of two basic types, namely, those with
  • the output beam is of 5 a small rectangular cross-section whilst in the latter it is of a circular cross-section which makes it easier to match into optical components, for example, optical lenses and optical fibres.
  • This invention allows for the coherent phase-locking of diode arrays by connecting each diode to an optical fibre or an optical ⁇ o fibre tape to accommodate the rectangular cross-section output beam more effectively.
  • the opposite ends of the said fibres are then placed in a bundle of such fibre ends to form a phase-locked output aperture - partially transmitting mirror combination which can be scaled to the required output power level simply by adding is more fibre ends to said bundle.
  • an array of individual laser diodes can be phase-locked together via the interactions occurring at the fibre bundle output mirror end face.
  • a series of single laser diodes can be phase-locked into a coherent array which is scaleable to high power levels.
  • the heat generating 20 laser diodes can be well cooled in the invention because they are not packed too close together. Also the passive optical fibres introduce relatively little loss in the invention when effectively coupled to the diode lasers, in fact losses as low as a few percent can be achieved. 25 • There are three phase-locking techniques that can be utilised to phase-lock the output beam of the invention. Firstly, the fibre core separation in the output aperture can be comparable to the
  • SUBSTITUTE SHEET core diameter so that evanescent coupling, that is direct core to core optical coupling occurs.
  • diffractive effects can be used to direct a portion of the output of one core into its neighbours within the array via a partially reflecting output mirror.
  • a micro lens array can be used to couple the output of each fibre forming the fibre bundle end face so that a parallel beam can be reflected off a plane, partially transmitting output mirror back into the fibre array with phase-locking occurring between the lens array and the output mirror.
  • diode lasers By combining the properties of diode lasers with that of passive optical fibres a very effective diode-fibre hybrid laser is produced which not only allows for the phase-locking of a large number of laser diodes, but does so in a manner which is scaleable to high power levels simply by adding more fibre ends to the output 5 aperture.
  • Another object of the invention is to bundle together said diode-
  • SUBSTITUTE SHEET optically polished and positioned so as to form a single output aperture which can be phase-locked using a partially transmitting mirror positioned at such a distance from said aperture that a portion of the laser beam emitted from any given fibre core is reflected into neighbouring cores.
  • Another object of the invention is to provide partially transmitting output mirror on the rear surface of a substrate whose front surface is attached to a micro lens array, allowing for the phase-locking of the invention to take place within the said substrate.
  • Another object of the invention is to provide a diode-fibre hybrid laser system which can be scaled to any practical power 5 output level by simply adding more diode-fibre hybrid oscillators to a bundle of said hybrid oscillators and phase-locking these output beams to provide a single output beam.
  • phase-locked output aperture composed of an array of diode fibre hybrid laser oscillators whose individual output powers are relatively low but whose combined, phase-locked array power is relatively high and focussable to a power density that results in efficiency frequency conversion when said output beam is focussed through a non-linear crystal.
  • Laser diode arrays are difficult to coherently phase-lock and tend to phase-lock in pockets across the array, in the case of iaser diode beams of rectangular cross-sections, a difficulty exists in matching such laser beams to the cores of single optical fibres.
  • the coupling of such laser beams to tapes of opticai fibre cores is a much more efficient process because a line of such fibre cores present a rectangular cross-section.
  • iaser diodes can be electronically switched allows for the diode-fibre hybrid laser to significantly enhance the properties of passive optical fibres regarding laser beam generation and laser beam steering. Also by selectively switching the individual diode, it is possible to generate images in the output aperture of said diode-fibre hybrid laser systems. It is clear that by adding passive opticai fibres to diode iasers, it is possible to provide for the coherent phase-locking of group of phase-locked diode arrays which effectively provides for the
  • Figure 1 shows a schematic layout of the diode array unit of the invention which is fibre coupled via a lens to focus the output o of the array into a single mode fibre.
  • Figure 2 shows two elements of the invention with their fibre output ends stacked together to allow for a phase-locked laser output beam.
  • Figure 3 shows the use of an output etalon to couple the light 5 from one of the fibre ends to another so as to produce a single beam phase-locked output.
  • the beam can be increased in intensity for frequency conversion at higher efficiency using a telescope in the reverse mode and a non-linear optical input.
  • Figure 4 shows a fibre coupled array of laser diode arrays o computer controlled to ensure that the final output beam is phase- locked and fully steerable.
  • This configuration of the invention is frequency tuneable, using non-linear optical effects within the fibre couplers themselves.
  • numeral 1 indicates the substrate onto which the diode array indicated by numeral 2 is mounted.
  • Numeral 3 indicates the electrical power supply which is used to excite diode array 2.
  • Numeral 4 indicates the single, phase-locked laser output beam of diode array 2 whilst numeral 5 indicates a rod lens which focusses said diode array (2) output (4) in a spot diameter of 10 microns
  • Numeral 7 indicates the cladding surrounding fibre core ⁇ o 6 which both minimises the optical losses from the said core 6 and provides a mechanically strong medium which can protect the fragile fibre core.
  • Numeral 9 indicates an index-matching medium inserted between low reflecting mirror 10 at the optically polished end-face indicated by numeral 11.
  • Numeral 12 indicates a phase-
  • numeral 14 indicates a telescope used to reduce the output beam diameter of the invention such that the intensity of said output beam increases to a level where its frequency
  • numeral 17 indicates a phase-locked stack of optically polished single mode fibre ends forming the output
  • Numeral 18 indicates a micro iens array on the inner face of an optical substrate indicated by numeral 19 which has a partially transmitting mirror on the substrate face SUBSTITUTE SHEET indicated by numeral 20.
  • the ovens/coolers used to vary the operating temperature and hence the output wavelengths of the diode arrays 2 indicated by numeral 22.
  • Numeral 23 indicates the computer used to control both the switching and phase of the iaser beams emitted by diode arrays 2.
  • Computer controlled switching of the diode arrays of the invention can control the phases of the emitted laser beams to ensure the precise steering of the final phase-locked output laser beam of the invention.
  • ⁇ o The invention allows for outputs of a large number of coherently phase-locked diode arrays to be combined into a single, scaleable, phase-locked output aperture composed of optically polished, anti-reflection coated ends of single mode optical fibres in one of the preferred configurations of the invention.
  • the phase- i s locked output beam of the invention can be frequency tuned either by the temperature tuning of the diode arrays themselves, utilising the non-linear optical effects that can be realised within the single mode fibre cores or by using non-linear crystals and concentrated output beams.
  • the flexible fibre bundle coupler allows for the 20 mounting on robotic arms used in industrial workstations.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)

Abstract

L'invention se rapporte à un laser hybride à diodes et à fibres, dans lequel des groupes de réseaux de diodes à verrouillage de phase cohérente (2) émettent des faisceaux (4) qui sont focalisés dans des fibres optiques (7). Les extrémités de sortie reflétées des fibres sont réunies en faisceau dans un réseau à verrouillage de phase (11), dont le verrouillage de phase est assuré par couplage optique directe entre les noyaux des fibres optiques. Le verrouillage de phase peut également être obtenu par reflexion dans des noyaux voisins au moyen d'un miroir de sortie à transmission partielle (8) ou par un réseau de micro-lentilles. Est également revendiqué un oscillateur hybride séparé comprenant un laser à diodes et une lentille focalisant la sortie du laser à diodes dans une fibre optique passive, dans l'autre extrémité et constituée par un miroir à transmission partielle. Les oscillateurs séparés du réseau peuvent être soumis à une commutation sélective destinée à produire une image à faisceaux de sortie laser haute définition ou à créer une différence de temps entre l'émission de la lumière à travers l'ouverture de sortie, ce qui entraîne une inclinaison régulée du front d'ondes du faisceau de sortie, permettant ainsi de diriger le faisceau de sortie (12).
PCT/AU1990/000293 1989-07-06 1990-07-06 Reseaux laser segmentes a diodes couplees par fibres WO1991001056A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ5121 1989-07-06
AUPJ512189 1989-07-06

Publications (1)

Publication Number Publication Date
WO1991001056A1 true WO1991001056A1 (fr) 1991-01-24

Family

ID=3774042

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000293 WO1991001056A1 (fr) 1989-07-06 1990-07-06 Reseaux laser segmentes a diodes couplees par fibres

Country Status (1)

Country Link
WO (1) WO1991001056A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266970A (en) * 1992-05-15 1993-11-17 Andrew John Neave A light distribution unit for use with a light projector which projects light via light guides
DE4301689A1 (de) * 1993-01-22 1994-07-28 Deutsche Forsch Luft Raumfahrt Leistungsgesteuertes fraktales Lasersystem
EP0709941A1 (fr) * 1994-07-27 1996-05-01 Laser Industries Limited Méthode et dispositif pour générer des sources de lumière intense
EP0723323A2 (fr) * 1994-12-22 1996-07-24 CeramOptec GmbH Système laser de puissance à haute densité
US6157755A (en) * 1997-03-17 2000-12-05 Deutsches Zentrum Fuer Luft-Und Raumfahrt E.V. Laser system
DE4490251B4 (de) * 1993-01-22 2004-04-22 Deutsches Zentrum für Luft- und Raumfahrt e.V. Phasengesteuertes fraktales Lasersystem
DE19811032B4 (de) * 1997-03-17 2007-10-25 Deutsches Zentrum für Luft- und Raumfahrt e.V. Lasersystem
US11063404B1 (en) 2018-09-13 2021-07-13 Nlight, Inc. Bidirectionally emitting semiconductor laser devices
US11495942B2 (en) 2016-10-28 2022-11-08 Nlight, Inc. Method, system and apparatus for higher order mode suppression
US11824323B1 (en) 2018-12-06 2023-11-21 Nlight, Inc. Diode laser package for bidirectionally emitting semiconductor laser devices

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5351479A (en) * 1978-12-08 1980-06-26 Ajoy Kumar Ghatak Phased array optical scanning
JPS5773988A (en) * 1980-10-27 1982-05-08 Nippon Telegr & Teleph Corp <Ntt> Laser oscillator
US4479224A (en) * 1981-10-26 1984-10-23 Massachusetts Institute Of Technology Fiber-coupled external cavity semiconductor laser
AU3874285A (en) * 1984-02-15 1985-08-22 Laser Holdings Limited Composite laser oscillator
EP0246793A2 (fr) * 1986-05-19 1987-11-25 AT&T Corp. Laser à mode fondamental et transversal et à haute puissance
EP0258665A2 (fr) * 1986-09-03 1988-03-09 Hitachi, Ltd. Laser à semi-conducteur
WO1988007216A1 (fr) * 1987-03-13 1988-09-22 Plessey Overseas Limited Appareil de multiplexage optique de division de longueur d'onde
US4794617A (en) * 1985-09-25 1988-12-27 Siemens Aktiengesellschaft External optical resonator for a semiconductor laser
US4799234A (en) * 1986-09-29 1989-01-17 Siemens Aktiengesellschaft Laser transmitter including an external optical resonator
AU3416589A (en) * 1988-04-05 1989-11-03 Australian National University, The Laser with variable-direction output beam
AU3831289A (en) * 1988-06-16 1990-01-12 Austral Asian Lasers Pty. Ltd. Phase locked hybrid laser
AU3965589A (en) * 1988-07-04 1990-01-23 Phased Array Lasers Pty. Ltd. End pumped, looped fibre bundle, phased array laser oscillator/amplifier

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5351479A (en) * 1978-12-08 1980-06-26 Ajoy Kumar Ghatak Phased array optical scanning
JPS5773988A (en) * 1980-10-27 1982-05-08 Nippon Telegr & Teleph Corp <Ntt> Laser oscillator
US4479224A (en) * 1981-10-26 1984-10-23 Massachusetts Institute Of Technology Fiber-coupled external cavity semiconductor laser
AU3874285A (en) * 1984-02-15 1985-08-22 Laser Holdings Limited Composite laser oscillator
US4794617A (en) * 1985-09-25 1988-12-27 Siemens Aktiengesellschaft External optical resonator for a semiconductor laser
EP0246793A2 (fr) * 1986-05-19 1987-11-25 AT&T Corp. Laser à mode fondamental et transversal et à haute puissance
EP0258665A2 (fr) * 1986-09-03 1988-03-09 Hitachi, Ltd. Laser à semi-conducteur
US4799234A (en) * 1986-09-29 1989-01-17 Siemens Aktiengesellschaft Laser transmitter including an external optical resonator
WO1988007216A1 (fr) * 1987-03-13 1988-09-22 Plessey Overseas Limited Appareil de multiplexage optique de division de longueur d'onde
AU3416589A (en) * 1988-04-05 1989-11-03 Australian National University, The Laser with variable-direction output beam
AU3831289A (en) * 1988-06-16 1990-01-12 Austral Asian Lasers Pty. Ltd. Phase locked hybrid laser
AU3965589A (en) * 1988-07-04 1990-01-23 Phased Array Lasers Pty. Ltd. End pumped, looped fibre bundle, phased array laser oscillator/amplifier

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
APPLIED PHYSICS LETTERS, Volume 52, No. 21, 23 May 1988, LEGER et al., "Coherent Addition of AlgaAs Lasers Using Micro Lenses and Diffractive Coupling", see page 1771 to 1773. *
PATENT ABSTRACTS OF JAPAN, E-124, page 104; & JP,A,57 073 988 (NIPPON DENSHIN DENWA KOSHA), 8 May 1982. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266970B (en) * 1992-05-15 1995-05-31 Andrew John Neave A light distribution unit for use with a light projector which projects light via light guides
GB2266970A (en) * 1992-05-15 1993-11-17 Andrew John Neave A light distribution unit for use with a light projector which projects light via light guides
DE4490252B4 (de) * 1993-01-22 2005-07-28 Deutsches Zentrum für Luft- und Raumfahrt e.V. Leistungsgesteuertes fraktales Lasersystem
DE4301689A1 (de) * 1993-01-22 1994-07-28 Deutsche Forsch Luft Raumfahrt Leistungsgesteuertes fraktales Lasersystem
DE4490251B4 (de) * 1993-01-22 2004-04-22 Deutsches Zentrum für Luft- und Raumfahrt e.V. Phasengesteuertes fraktales Lasersystem
EP0709941A1 (fr) * 1994-07-27 1996-05-01 Laser Industries Limited Méthode et dispositif pour générer des sources de lumière intense
EP0723323A2 (fr) * 1994-12-22 1996-07-24 CeramOptec GmbH Système laser de puissance à haute densité
EP0723323A3 (fr) * 1994-12-22 1996-09-11 Ceramoptec Gmbh Système laser de puissance à haute densité
US6157755A (en) * 1997-03-17 2000-12-05 Deutsches Zentrum Fuer Luft-Und Raumfahrt E.V. Laser system
DE19811032B4 (de) * 1997-03-17 2007-10-25 Deutsches Zentrum für Luft- und Raumfahrt e.V. Lasersystem
US11495942B2 (en) 2016-10-28 2022-11-08 Nlight, Inc. Method, system and apparatus for higher order mode suppression
US11063404B1 (en) 2018-09-13 2021-07-13 Nlight, Inc. Bidirectionally emitting semiconductor laser devices
US11824323B1 (en) 2018-12-06 2023-11-21 Nlight, Inc. Diode laser package for bidirectionally emitting semiconductor laser devices

Similar Documents

Publication Publication Date Title
US6208679B1 (en) High-power multi-wavelength external cavity laser
US5946130A (en) Optical fiber amplifier network having a coherently combined output and high-power laser amplifier containing same
US6327291B1 (en) Fiber stub end-pumped laser
US5715270A (en) High efficiency, high power direct diode laser systems and methods therefor
US5115445A (en) Microchip laser array
US6192062B1 (en) Beam combining of diode laser array elements for high brightness and power
EP0306136B1 (fr) Laser modulé dans la bande d&#39;émission bleue
US20070002925A1 (en) External cavity laser diode system and method thereof
US5668903A (en) Compound laser system for high power densities
US5050173A (en) Looped, phased array laser oscillator
US6434177B1 (en) Solid laser with one or several pump light sources
US8422524B2 (en) Rotary disk laser and amplifier configurations
US5276758A (en) Scaleable phase-locked segmented laser beam frequency shifter
WO1991001056A1 (fr) Reseaux laser segmentes a diodes couplees par fibres
US5084882A (en) Face pumped, looped fibre bundle, phased array laser oscillator
US5048027A (en) Hybrid laser
WO1990013158A1 (fr) Oscillateur laser a reseau asservi en phase, compose d&#39;un faisceau de fibres optiques a laser, serrees et a pompage par diodes sur la face terminale
GB2254485A (en) End-pumped solid-state laser.
US5999554A (en) Fiber stub end-pumped laser
AU5953290A (en) Segmented, fibre coupled diode laser arrays
WO1991002391A1 (fr) Systeme de laser a diode emettant un faisceau laser de haute qualite, a section transversale circulaire perpendiculaire au socle
Zhu et al. Development and thermal management of kW-class high-power diode laser source based on the structure of two-stage combination
US5729375A (en) Optical amplification system with non-orthogonal signal and distributed multi-pump beams and photorefractive cleanup
WO1991005380A1 (fr) Oscillateur laser verrouille en phase a faisceau plie de fibres laser
WO1991001057A1 (fr) Reseaux groupes a diodes verrouillees en phase

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE

WR Later publication of a revised version of an international search report