FR3119684B1 - TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM - Google Patents

TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM Download PDF

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Publication number
FR3119684B1
FR3119684B1 FR2101212A FR2101212A FR3119684B1 FR 3119684 B1 FR3119684 B1 FR 3119684B1 FR 2101212 A FR2101212 A FR 2101212A FR 2101212 A FR2101212 A FR 2101212A FR 3119684 B1 FR3119684 B1 FR 3119684B1
Authority
FR
France
Prior art keywords
profile
applying
command
temporal
laser beam
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.)
Active
Application number
FR2101212A
Other languages
French (fr)
Other versions
FR3119684A1 (en
Inventor
Hervé Coïc
Pauline Fourtillan
Benjamin Anthouard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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 Commissariat a lEnergie Atomique CEA, Commissariat a lEnergie Atomique et aux Energies Alternatives CEA filed Critical Commissariat a lEnergie Atomique CEA
Priority to FR2101212A priority Critical patent/FR3119684B1/en
Priority to PCT/FR2022/050238 priority patent/WO2022171959A1/en
Publication of FR3119684A1 publication Critical patent/FR3119684A1/en
Application granted granted Critical
Publication of FR3119684B1 publication Critical patent/FR3119684B1/en
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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
    • H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/212—Mach-Zehnder type

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)
  • Laser Beam Processing (AREA)

Abstract

La présente invention concerne un procédé et un système de mise en forme temporelle ou spatiale d’un faisceau laser au moyen d’un modulateur (23), l’intensité du faisceau pouvant être contrôlée au cours du temps par une commande contrôlant la transmission du modulateur (23) en un instant donné, la forme temporelle ou spatiale à obtenir étant définie par un profil de consigne, ledit système comportant un processeur (13) configuré pour utiliser des fonctions de transfert directe et inverse  modélisant une relation entre la commande et le profil d’un faisceau laser de sortie, pour mettre en œuvre un processus d’asservissement comprenant les opérations suivantes : -déterminer une commande initiale en appliquant la fonction de transfert inverse  sur le profil de consigne ; -déterminer un profil de simulation en appliquant la fonction de transfert directe sur la commande de l’itération précédente ; -calculer un écart entre le profil de consigne et un profil observé obtenu par un module d’acquisition (9) ; -appliquer ledit écart au profil de simulation pour obtenir un profil de simulation corrigé ; -calculer la commande courante en appliquant la fonction de transfert inverse  sur le profil de simulation corrigé ; -commander le modulateur (23) au moyen de la commande courante , et -tester si un critère d’arrêt est vérifié. Fig. 1The present invention relates to a method and a system for temporal or spatial shaping of a laser beam by means of a modulator (23), the intensity of the beam being able to be controlled over time by a command controlling the transmission of the modulator (23) at a given instant, the temporal or spatial shape to be obtained being defined by a setpoint profile, said system comprising a processor (13) configured to use forward and reverse transfer functions modeling a relationship between the command and the profile of an output laser beam, to implement a servo process comprising the following operations: -determine an initial command by applying the inverse transfer function on the setpoint profile; - determine a simulation profile by applying the direct transfer function to the control of the previous iteration; - calculate a difference between the setpoint profile and an observed profile obtained by an acquisition module (9); -applying said deviation to the simulation profile to obtain a corrected simulation profile; - calculate the current command by applying the inverse transfer function on the corrected simulation profile; -control the modulator (23) by means of the current command, and -test if a stopping criterion is verified. Fig. 1

FR2101212A 2021-02-09 2021-02-09 TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM Active FR3119684B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR2101212A FR3119684B1 (en) 2021-02-09 2021-02-09 TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM
PCT/FR2022/050238 WO2022171959A1 (en) 2021-02-09 2022-02-09 Spatial or temporal shaping of a laser beam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2101212 2021-02-09
FR2101212A FR3119684B1 (en) 2021-02-09 2021-02-09 TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM

Publications (2)

Publication Number Publication Date
FR3119684A1 FR3119684A1 (en) 2022-08-12
FR3119684B1 true FR3119684B1 (en) 2023-02-24

Family

ID=75690427

Family Applications (1)

Application Number Title Priority Date Filing Date
FR2101212A Active FR3119684B1 (en) 2021-02-09 2021-02-09 TEMPORAL OR SPATIAL SHAPING OF A LASER BEAM

Country Status (2)

Country Link
FR (1) FR3119684B1 (en)
WO (1) WO2022171959A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3094252B1 (en) * 2019-03-27 2021-04-16 Commissariat Energie Atomique SPATIAL OR TEMPORAL SHAPING METHOD OF A LASER BEAM

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6516555B2 (en) * 2015-05-15 2019-05-22 浜松ホトニクス株式会社 Modulation pattern calculation device, light control device, modulation pattern calculation method and modulation pattern calculation program
FR3094252B1 (en) 2019-03-27 2021-04-16 Commissariat Energie Atomique SPATIAL OR TEMPORAL SHAPING METHOD OF A LASER BEAM

Also Published As

Publication number Publication date
WO2022171959A1 (en) 2022-08-18
FR3119684A1 (en) 2022-08-12

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