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WO2007018675A2 - Appareil a laser pulse et procede d'utilisation - Google Patents

Appareil a laser pulse et procede d'utilisation Download PDF

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Publication number
WO2007018675A2
WO2007018675A2 PCT/US2006/019799 US2006019799W WO2007018675A2 WO 2007018675 A2 WO2007018675 A2 WO 2007018675A2 US 2006019799 W US2006019799 W US 2006019799W WO 2007018675 A2 WO2007018675 A2 WO 2007018675A2
Authority
WO
WIPO (PCT)
Prior art keywords
signal
optical pulses
pump
generate
command
Prior art date
Application number
PCT/US2006/019799
Other languages
English (en)
Other versions
WO2007018675A3 (fr
Inventor
Thomas Eckardt
Balko Blaschej
Original Assignee
Newport Corporation
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 Newport Corporation filed Critical Newport Corporation
Publication of WO2007018675A2 publication Critical patent/WO2007018675A2/fr
Publication of WO2007018675A3 publication Critical patent/WO2007018675A3/fr

Links

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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/115—Q-switching using intracavity electro-optic devices
    • 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
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038—Amplitude control
    • H01S3/10046—Pulse repetition rate control
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/1645—Solid materials characterised by a crystal matrix halide
    • H01S3/1653—YLiF4(YLF, LYF)

Definitions

  • Pulsed laser systems have generally exhibited operational artifacts that result in non- optimum effects at the laser target.
  • One of these problems is pulse-to-pulse variation.
  • the first pulse of a sequence of laser pulses has an amplitude higher than desired. This higher energy pulse can cause damage to optics in the laser, the optical train, and/or the actual laser target, such as welded metal joints, human skin, flat panel displays, etc.
  • FPS First Pulse Suppression
  • Fig. 1 shows a schematic diagram of an exemplary prior art system 100 for controlling pulsed lasers.
  • the system 100 includes a pulsed laser system 110 and a user-operated computer 150 for controlling the pulse generation of the pulsed laser system 110.
  • the pulsed laser system 110 includes an analog interface 112, a pump light source 114, operation electronics 116, and an optics and Q-switch module 118.
  • the user-operated computer 150 includes an analog interface 152 for interfacing with the analog interface 112 of the pulsed laser system 110.
  • Fig. 2 shows a timing diagram of the signals generated in the system 100. Two of these signals include a pulse trigger signal 154 and a pump current signal 156, both generated by the user- operated computer 150. The other signals include output optical pulses 122 and a pulse monitoring signal 124, both generated by the pulse laser system 110.
  • the user-operated computer 150 through the analog interface 152, generates the "real-time" control pulse trigger signal 154 and the pump diode current signal 156, which are sent to the analog interface 112 of the pulsed laser system 110.
  • the analog interface 112 conditions and sends the "real-time” pulse trigger signal 154 to the operation electronics 116, which, in turn, controls the pulse generation of the light emitted by the optics and Q- switched module 118.
  • the analog interface 112 also conditions and sends the "real-time" pump diode current signal 156 to the pump light source 114, which generates the pump signal 120 to create inversion in the laser medium of the optics and Q-switched module 118.
  • the optics and Q-switched module 118 generates the output optical pulses 122 in accordance with the pump signal 120 generated by the pump light source 114 and the trigger signal 154 conditioned by the operation electronics 116.
  • the optics and Q-switched module 118 also generates pulse monitor signal 124 indicative of the generation of the output optical pulses, which the signal 124 is sent back to the user-operated computer 150 via the analog interfaces 112 and 152.
  • the "real-time" control of the pulse laser system 110 by the user- operated computer 150 may result in substantially inaccuracies in the output optical pulses 122 generated by the pulse laser system 110.
  • inaccuracies in the timing of the pulse trigger signal 154 translates into inaccuracies in the timing of the output optical pulses 122.
  • inaccuracies in the pump current signal 156 translates into inaccuracies in the energy level of the output optical pulses 122.
  • inaccuracies in the timing of the pump current signal 156 with respect to the trigger signal 154 may adversely affect the FPS control.
  • external noise and signal interference may creep into the output optical pulses 122 via the "real-time" signals generated by the user-operated computer 150.
  • a pulsed laser system comprises one or more pump sources adapted to generate at least one pump signal; at least one control device adapted to receive one or more burst execution commands from the user-operated computer, generate a pulse modulating signal in accordance with the burst execution command, and generate a pump control signal to control the pump source in generating the pump signal in accordance with the burst execution command; and one or more optics modulator modules adapted to generate the optical pulses in response to the pump signal and the pulse modulating signal.
  • the control device performs "real-time" control of the optical pulses in accordance with the burst execution command received from the external control device.
  • the method comprises the steps of receiving a command from a user-operated computer, wherein the command includes a timing parameter that defines when the optical pulses are to be generated; and generating the optical pulses in response to the command, while controlling when the optical pulses are generated in accordance with the timing parameter.
  • the timing control is performed in response to the command received from the user-operated computer. As discussed above, this effectively isolates the output optical pulses from inaccuracies associated with the user-operated computer and from external noise and signal interference that may creep in via the command input.
  • FIG. 1 shows a schematic of a prior art system for controlling pulsed lasers
  • FIG. 2 shows a diagram of control inputs and laser pulses using the prior art control method from Fig. 1 ;
  • FIG. 3 shows a schematic diagram of an exemplary pulsed laser system and method of controlling pulsed lasers in accordance with an embodiment of the invention.
  • FIG. 4 shows a diagram of control input and laser pulses over time in the pulse laser system in accordance with another embodiment of the invention.
  • FIG. 5 shows an embodiment of an optics modulator module for use in an embodiment of a pulsed laser system.
  • Fig. 3 shows a schematic layout of an exemplary system 300 for controlling the output of a pulsed laser.
  • the system 300 comprises a pulsed laser system 310 and a user-operated computer 350 for providing instructions on how to generate a pre-defined burst of optical pulses to the pulsed laser system 310.
  • the pulsed laser system 310 comprises at least one microcontroller 312, at least one pump source 318, operation electronics 320, at least one optics modulator module 322, and one or more pulse energy measurement devices 324.
  • the user-operated computer 350 receives an instruction from a user as to how the pulsed laser system 310 is to generate a burst of optical pulses.
  • the user-operated computer 350 generates one or more burst execution command 352 defining a burst of optical pulses for which the pulsed laser system 310 is to generate.
  • the burst execution command 352 may define such burst parameters as the number of optical pulses, the repetition period of the pulses, and the power level of the pulses.
  • the command 352 need not specify the number of pulses if the pulsed laser system 310 is to be operated in a free-running mode.
  • the burst execution command 352 may be in digital format or in analog format.
  • the burst execution command 352 may take the form of a two part command sent to the pulse laser system 310 in two separate intervals.
  • the first part of the command 352 may define the burst parameters, as discussed above.
  • the second part of the command 352 may include a start trigger prompting the pulsed laser system 310 to begin generating the burst of optical pulses in accordance with the first part of the command 352.
  • the burst execution command 352 including the burst parameter and the start trigger may be sent to the pulsed laser system 310 in a single interval or in multiple intervals.
  • the microcontroller 312 receives the burst execution command 352 from the user- operated computer 350.
  • the pulse triggering module 316 of the microcontroller 312 is responsible for generating one or more pulse trigger signals 330 in accordance with the burst execution command 352. In this regard, the pulse triggering module 316 sets the repetition period 332 (refer to Fig. 4) of the pulse trigger signal 330, maintains the current pulse count of the trigger signal 330, and limits the number of pulses in the pulse trigger signal 330.
  • the pump control module 314 of the microcontroller 312 is responsible for generating at least one pump control signal 334 in accordance with the burst execution command 352. In this regard, the pump control module 314 sets the energy and duration of the pump signal 342 produced by the pump source 318.
  • the pump control module 314 may be responsible for controlling the start times of the pump control signal 340 and the pulse triggering signal 330 for the purpose of FPS control.
  • the pump control module 314 starts the pump control signal 340 a "pre-pump time" 336 (refer to Fig. 4) before the first pulse of the pulse triggering signal 330 is generated. This allows time for the pump signal 342 produced by the pump source 318 to generate a distinct inversion in the laser before the pulses are applied to the optics and Q-switch module 322.
  • the pump control module 314 may be responsible for calibrating the output power of the optical pulses generated by the optics modulator module 322.
  • the pump control module 314 receives at least one power measurement signal 346 generated by the pulse energy measurement device 324, which, in turn, receives a sample 344 of the output optical pulses.
  • the power measurement signal 346 is indicative of the energy level of the output optical pulses.
  • the pump control module 314 uses the power measurement signal 346 for calibration of the pump control signal 340 so that the desired energy for the output optical pulses is achieved.
  • the operation electronics 320 generates the pulse modulating signal 334 in response to the pulse triggering signal 330 generated by the microcontroller 312.
  • the pump source 318 which may comprise one or more laser diodes and corresponding diode drive electronics, generates the pump signal 342 that causes energy inversion in the optics modulator module 322.
  • a single pump source 318 irradiates the pump signal 342 to the optics modulator module 322.
  • multiple pump sources 318 may irradiate any number of pump signals 342 to the optics modulator module 322.
  • Exemplary pump sources 318 include, without limitation, diode laser sources, gas laser sources, solid state laser sources, vertical cavity surface emitting laser sources (VCSELs), extended cavity emitters, ultra-fast laser systems, tunable laser sources, dye lasers, fiber laser sources, and the like.
  • the optics modulator module 322 converts the pump signal 342 into the output optical pulses 348 in accordance with the pulse modulating signal 334 generated by the operation electronics 320.
  • the optics modulator module 322 comprises a Q-switch.
  • the optics modulator module 322 may comprise an electro-optic modulator.
  • the optics modulator module 322 comprises an acousto-optic modulator (AOM).
  • the optics modulator module 322 comprises a flashlamp and associated control hardware.
  • the optics modulator module 322 may include one or more optical elements or devices or additional operational devices therein. As shown in FIG. 5, the optics modulator module 322 may include at least one Q-switch 360 positioned between first mirror 362 and a second mirror 364. One or more optical crystals may be positioned within the optics modulator module 322. In the illustrated embodiment, a Nd: YLF optical crystal 366 is positioned within the optics modulator module 322. Those skilled in the art will appreciate that any number and variety of optical crystals may be positioned within the optics modulator module 322, including, without limitation, Nd: YAG crystals, Nd:YVO 4 crystals, LBO crystals, LiNBO 4 crystals, and the like.
  • one or more harmonic conversion elements or materials may be positioned within the optics modulator module 322.
  • a second harmonic conversion element 370 and a third harmonic conversion element 372 are included within the optics modulator module 322.
  • additional harmonic conversion elements enabling fourth harmonic conversion, fifth harmonic conversion, sixth harmonic conversion, and the like may be positioned within the optics modulator module 322.
  • one or more additional optical elements 368 may be included within the optics modulator module 322.
  • the optical element 368 comprises an outcoupler configured to output at least one optical signal from the optics modulator module 322.
  • the pump source 318 may include one or more pump signal sources 380 and one or more optical elements or devices 382 configured to receive and condition a signal from the pump signal source 380 and output a conditioned signal to the optics modulator module 322.
  • the pulse energy measurement device 324 receives a sample 344 of the output optical pulses 348, and generates the power measurement signal 346 for the microcontroller 312 to properly calibrate and regulate the energy of the output optical pulses 348.
  • Fig. 4 shows a timing diagram of the signals generated in the system 300.
  • the upper most signal is the burst command signal 352 generated by the user-operated computer 350.
  • the second signal from the top is the pump signal 342 generated by the pump source 318.
  • the third signal from the top is the pulse triggering signal 330 generated by the microcontroller 312, and the bottom signal is the optical pulses generated by the optics modulator module 322.
  • the following describes an exemplary operation of the system 300.
  • the user-operated computer 350 first sends the burst execution command 352 to the microcontroller 312 of the pulsed laser system 310.
  • the microcontroller 312 hi response to the burst execution command 352, the microcontroller 312 generates the pump control signal 340 to cause the pump source 318 to generate the pump signal 342 in accordance with the energy level specified in the burst execution command 352.
  • the microcontroller 312 After a "pre-pump time” period 336 from the start of the pump signal 342, the microcontroller 312 generates the pulse triggering signal 330 in accordance with the repetition period specified in the burst execution command 352.
  • the "pre- pump time" 336 allows the pump signal 342 to generate a distinct inversion in the modulator 322 for FPS control purposes.
  • the optics modulator module 322 In response to the pump signal 342 and the pulse modulating signal 334, the optics modulator module 322 generates the output optics pulses 348.
  • the microcontroller 312 maintains the energy level of the output optical pulses 348 by adjusting the pump control signal 340 in response to the power measurement signal 346 received from the pulse energy measurement device 324.
  • the "real-time" pulse generation control of the pulsed laser system 310 is performed internally by the microcontroller 312, timing inaccuracies in the burst execution command 352 issued by the user-operated computer 350 does not generally affect the output optical pulses generated by the pulsed laser system 310.
  • having the "real-time” control performed internally in the pulsed laser system 310 effectively isolates the output optical pulses from inaccuracies associated with the user-operated computer 350.
  • the internal “real-time” control also effectively isolates the output optical pulses from external noise and signal interference that may creep in via the command input.
  • the internal timing and signal management avoids the need for external real time control reducing significantly the user effort for laser operation.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un système à laser pulsé conçu pour générer des impulsions optiques en réponse à la réception d'une commande provenant d'un ordinateur manipulé par un utilisateur. Le système à laser pulsé comprend une source de pompage conçue pour générer un signal de pompage; un microcontrôleur conçu pour recevoir une commande d'exécution en rafale provenant de l'ordinateur, générer un signal de modulation d'impulsion en fonction de la commande d'exécution en rafale et générer un signal de commande de pompage afin de commander la source de pompage lors de la génération du signal de pompage en fonction de la commande d'exécution en rafale; et un module de modulateur optique conçu pour générer des impulsions optiques en réponse au signal de pompage et au signal de modulation d'impulsions. Le microcontrôleur commande en temps réel les impulsions optiques en fonction de la commande d'exécution en rafale provenant d'un ordinateur manipulé par un utilisateur. Grâce à l'exécution de la commande en temps réel par le microcontrôleur, la sortie est efficacement séparée des erreurs, du bruit et des interférence qui peuvent s'introduire dans l'entrée de commande.
PCT/US2006/019799 2005-05-23 2006-05-22 Appareil a laser pulse et procede d'utilisation WO2007018675A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68368105P 2005-05-23 2005-05-23
US60/683,681 2005-05-23

Publications (2)

Publication Number Publication Date
WO2007018675A2 true WO2007018675A2 (fr) 2007-02-15
WO2007018675A3 WO2007018675A3 (fr) 2007-03-22

Family

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Application Number Title Priority Date Filing Date
PCT/US2006/019799 WO2007018675A2 (fr) 2005-05-23 2006-05-22 Appareil a laser pulse et procede d'utilisation

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009027144A1 (fr) * 2007-08-31 2009-03-05 Robert Bosch Gmbh Procédé pour faire fonctionner un dispositif laser
WO2009030550A1 (fr) * 2007-09-05 2009-03-12 Robert Bosch Gmbh Procédé pour faire fonctionner un dispositif laser
WO2011003166A1 (fr) * 2009-07-06 2011-01-13 Institut National D'optique Laser à fibre picoseconde à durée d'impulsion réglable
US8144737B2 (en) 2009-07-06 2012-03-27 Institut National D'optique Adjustable pulsewidth picosecond fiber laser

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907235A (en) * 1988-04-01 1990-03-06 Laserscope Intra-cavity beam relay for optical harmonic generation
DE19747180A1 (de) * 1997-10-24 1999-07-22 Coherent Luebeck Gmbh Pulslaser mit Erstpulssteuerung
JP4003996B2 (ja) * 1998-09-21 2007-11-07 ミヤチテクノス株式会社 Ｑスイッチ型レーザ装置
US6418154B1 (en) * 1999-06-07 2002-07-09 Coherent, Inc. Pulsed diode-pumped solid-state laser
JP3838064B2 (ja) * 2001-09-28 2006-10-25 松下電器産業株式会社 レーザ制御方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009027144A1 (fr) * 2007-08-31 2009-03-05 Robert Bosch Gmbh Procédé pour faire fonctionner un dispositif laser
WO2009030550A1 (fr) * 2007-09-05 2009-03-12 Robert Bosch Gmbh Procédé pour faire fonctionner un dispositif laser
WO2011003166A1 (fr) * 2009-07-06 2011-01-13 Institut National D'optique Laser à fibre picoseconde à durée d'impulsion réglable
US8144737B2 (en) 2009-07-06 2012-03-27 Institut National D'optique Adjustable pulsewidth picosecond fiber laser

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