EP4139079A1 - Optical system for laser machining - Google Patents
Optical system for laser machiningInfo
- Publication number
- EP4139079A1 EP4139079A1 EP21719905.8A EP21719905A EP4139079A1 EP 4139079 A1 EP4139079 A1 EP 4139079A1 EP 21719905 A EP21719905 A EP 21719905A EP 4139079 A1 EP4139079 A1 EP 4139079A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mirror
- laser beams
- laser beam
- reflection
- laser
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 99
- 238000003754 machining Methods 0.000 title claims abstract description 49
- 238000000926 separation method Methods 0.000 claims abstract description 58
- 230000033001 locomotion Effects 0.000 claims abstract description 26
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Classifications
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- 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
- B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
- B23K26/0673—Dividing the beam into multiple beams, e.g. multifocusing into independently operating sub-beams, e.g. beam multiplexing to provide laser beams for several stations
-
- 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
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
-
- 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
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
-
- 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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
- B23K26/388—Trepanning, i.e. boring by moving the beam spot about an axis
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/106—Beam splitting or combining systems for splitting or combining a plurality of identical beams or images, e.g. image replication
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
-
- 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
- G02F1/13—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 based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136277—Active matrix addressed cells formed on a semiconductor substrate, e.g. of silicon
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/12—Function characteristic spatial light modulator
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/50—Phase-only modulation
Definitions
- the invention relates to a laser machining optical system. In another aspect, the invention relates to a method for providing a plurality of offset laser beams for machining a workpiece.
- Ultra-short pulse laser sources having average powers exceeding one hundred watts and making it possible to reach peak powers of the order of giga watt (therefore having energies per pulse greater than 1 mJ) are now available in the market. These theoretically allow an increase in productivity thanks to an increase in the machining speed.
- the use of such laser sources for machining a part, without lowering the average power of the laser source, is generally not possible, because of thermal effects on the part which can lead to deforming it. (or even destroy it), oxidize it, or modify it from a structural point of view.
- machining of a zone can be influenced by heating linked to the machining of an adjacent zone: the heat generated during the machining of such an adjacent zone does not have time to dissipate during the machining. machining a new area.
- precession devices In order to control or eliminate the taper of the cutting faces, precession devices have been developed. These precession devices make it possible to control the angle of attack of the laser beam on the target to be machined. This control of the angle of attack allows better control of the taper of the cutting faces.
- DE 10 2014 200 633 B3 describes a machining system for distributing the power of a laser source over an enlarged area, by dividing a spatially shifted laser beam into a plurality of spatially shifted secondary beams. This document also describes means for controlling the angle of attack of the plurality of secondary beams on a workpiece. Nevertheless, the machining device described in DE 10 2014 200 633 B3 is complex to implement, specific to a type of machining and difficult to adapt to changes in the power of the laser sources.
- one of the aims of the present invention is to provide an optical laser machining system making it possible to machine several patterns simultaneously on the same part more simply and in a more robust manner.
- a laser machining optical system comprising:
- a device comprising o separation means, for separating a source laser beam into a plurality of separate laser beams, so that each of the separated laser beams is directed in a direction of propagation which is specific to it; a spatial shift unit for obtaining from said plurality of separate laser beams a plurality of shifted laser beams so that each shifted laser beam can propagate around a main propagation axis A which is specific to it and is suitable for describe a movement around the main axis of propagation A;
- - focusing means configured to focus the laser beams shifted on a workpiece in the direction of its own propagation axis.
- the invention makes it possible to obtain a high quality of machining thanks to an offset and a movement of each of the beams around their own propagation axis before focusing, allowing after focusing on the part, to focus (or redirect) the beams in the direction of their propagation axis to have a non-zero angle of attack of each beam on the part.
- the laser machining optical system is particularly robust regarding the wide range of laser sources it can support. Indeed, the device requiring only a limited number of optical elements, preferably in reflection, allows the use of a wide range of wavelengths of laser radiation as well as of power and or pulse duration of laser radiation. source. Furthermore, the device is robust because it comprises a very limited number of optical elements. Preferably all the optical elements are configured in reflection.
- the device requires a small number of optical elements interacting with the beam, which makes it more robust. Indeed, this smaller number of optical elements presents a lower risk that the alignment of an optical element has to be corrected, causing the device to be unavailable.
- the device requires simpler and smaller separation means because they are positioned before the means for rotating the beam.
- Avant means here that the separation means interact with the source laser beam before the spatial shift unit on the optical path of the laser beam. Simpler and smaller separation means are necessarily more robust and less expensive. Thanks to the positioning of the separation means before the spatial shift unit, their programming is particularly easy because they are illuminated with a beam motionless.
- the separation means would have to be adjusted in real time in order to have beam separation for all of the beam shift positions thereon. It is therefore not compatible to place the separation means downstream of the spatial shifting means.
- the invention uses, downstream of the separation means, a spatial shift unit which is unique and receives all the separated beams, which makes it possible to easily apply the same shift to all the separated laser beams.
- the separation means separate the beams at a very low angle, which makes it possible to use focusing means which are a single optical element common to all the beams, which makes it possible to process a single piece with multiple beams. More preferably, the focusing means are telecentric.
- the invention allows the use of laser sources having a wide range of average laser powers and in particular laser sources having high average powers, in particular average powers greater than 100 W thanks to the use of a matrix optical modulation means for the separation of the laser beam.
- the invention makes it possible in particular to avoid the transport by an optical relay of the shifted laser beams as proposed by DE 10 2014 200 633 B3.
- Such a transport of high power laser pulses by optical relay to the workpiece can result in the generation of a plasma at the focal point (of the optical relay) which can cause a loss of power and resolution during machining of the part.
- the optical system of the invention allows the separation of the source laser beam into a plurality of laser beams, each laser beam being essentially collimated but propagating with slightly different angles.
- the plurality of laser beams can be viewed as being slightly divergent from a central axis of propagation. Such a divergence, due to the natural angles of each of the beams, then results in lateral offsets on the workpiece.
- the invention therefore makes it possible to obtain good machining quality in several positions of a part to be machined regardless of the power of the laser source used.
- the invention also allows faster machining thanks to the plurality of beams obtained and directed towards a workpiece, so that each beam, after focusing on the workpiece, allows the machining of a portion of the workpiece .
- the invention makes it possible to obtain a high quality of machining thanks to the lateral offset before focusing of each of the beams, resulting after focusing on the part, in a control of the angle of attack of each beam on the part.
- the plurality of laser beams separated by the separation means has a fixed polarization over time.
- the spatial shifting means are positioned downstream from the separation means in order to allow the spatial shifting of each separate beam propagating in a direction which is specific to them and regardless of their state of polarization.
- This is largely possible thanks to the use of spatial shifting means that do not use diffractive and / or refractive optical elements but mainly reflective optical elements.
- Downstream means that the spatial shift unit interacts with the source laser beam after the separation means on the optical path of the laser beam.
- the laser source of the optical system makes it possible to emit a pulsed laser beam, preferably with a pulse duration of between 10 10 s and 10 15 s, preferably between 10 11 s and 10 14 s.
- Laser machining with pulsed laser radiation preferably with ultra-short pulses (fs or between 10 10 s and 10 15 s) makes it possible to obtain good control of the machining. Good machining control generally translates into good machining quality.
- said main propagation axes A describe non-zero angles between them.
- said main axes of propagation A of each shifted laser beam describe a non-zero angle a between them.
- the plurality of offset laser beams capable of propagating around the main axes of propagation A of each offset laser beam describe non-zero angles between them.
- the angles a between the axes of propagation A are identical, which makes it easier to control the orientation and angle of attack of the beams on the workpiece.
- Such a non-zero angle ⁇ between each offset laser beam offers a relative divergence between them, which allows each of them to be able to be offset spatially or laterally by the spatial or lateral offset means.
- the divergence of these can be used in order to achieve sufficient separation between them when they are focused on the workpiece. Thanks to the separation means, it is possible to adjust this angle ⁇ and therefore the distance between the plurality of machining laser beams. For example in the case of matrix modulation means (LCOS), depending on the phase deviation map displayed, the angle a can then be adjusted.
- LCOS matrix modulation means
- each of said main propagation axes A of said offset laser beams describes an angle of between 0.005 ° and 1 ° with respect to a main propagation axis A being adjacent thereto, preferably 0.01 ° and 0.5 °, even more preferably between 0.05 and 0.2 °.
- this means that the spacing between two adjacent offset laser beams on a workpiece (at the focal point of the focusing means) is between 17 pm and 875 pm.
- the spacing is between 87 ⁇ m and 350 ⁇ m.
- one of the aims of the present invention is to provide an optical laser machining system with a device making it possible to adapt the machining laser beams in real time and independently of one another.
- the separation means are matrix modulation means, preferably matrix modulation means in reflection.
- the laser machining optical system makes it possible to offer great adaptability of the patterns which can be machined.
- the invention allows great adaptability of the machining obtained by virtue of the separation of the source laser beam by the optical matrix modulation means into a plurality of laser beams. separated.
- it is possible to modulate in real time the dimensions and position of the plurality of separate laser beams formed by the optical matrix modulation means.
- Such adaptability of the pattern to be machined in real time is implemented in a relatively simple manner because the invention allows the separation into a plurality of beams upstream of the beam shifting means allowing the precession of the latter on the workpiece. .
- the matrix optical modulation means is a spatial light modulator also known with the acronym SLM.
- SLM spatial light modulator
- Such an SLM can operate in reflection or transmission in order to interact with a source beam.
- An SLM makes it possible, for example, to spatially modify: the amplitude and / or the phase and / or the polarization of a beam having interacted with the optical matrix modulation means.
- the optical matrix modulator is a matrix phase modulator of the liquid crystal on silicon (LCOS SLM) type.
- An SLM is preferably of the electrically addressed liquid crystal matrix type.
- the first embodiment is particularly advantageous because it allows the use of matrix modulation means of relatively small area because illuminated with a fixed laser beam.
- the matrix modulation means upstream of the spatial shift unit, their programming is particularly easy because they are illuminated with a fixed beam. If the matrix modulation means were positioned downstream of the spatial shift means, as is the case in DE 10 2014 200 633 B3, then the matrix modulation means would have to be modulated in real time in order to have a separation of beam for all of the beam shift positions thereon.
- said matrix modulation means are matrix phase modulation means, preferably matrix phase modulation means in reflection.
- the matrix optical modulation means is an active optical element which makes it possible to spatially modulate laser radiation.
- the matrix modulation means makes it possible to modify the shape or the intensity of the beam by selectively modulating the interaction of the source laser beam with the matrix of pixels of the matrix optical modulation means.
- the display of a phase modulation map by the matrix optical modulation means makes it possible to separate by diffraction, a plurality of beams from a single source laser beam (collimated).
- the matrix optical modulation means allows modulation of the phase in reflection, and therefore the diffraction of the source beam into a plurality of beams by reflection.
- An advantage of the first embodiment is to use a matrix optical modulation means which induces only a negligible divergence on the plurality of diffracted beams, which does not require the use of collimation / focusing means between the means. matrix optical modulation and spatial shifting means in order to be able to transport the beam to the workpiece.
- said reflection matrix phase modulation means are an LCOS, in that they are able to separate said linearly polarized source laser beam into said plurality of laser beams separated.
- said separation means comprise a fixed diffractive optical element for beam shaping.
- the shaping of the laser beam corresponds to a separation of the laser beam into a plurality of separate laser beams.
- a fixed diffractive optical element is for example a DOE.
- the fixed diffractive optical element is a diffractive optical element in transmission.
- the fixed diffractive optical element is a first diffractive optical element fixed in reflection.
- the device further comprises a second diffractive optical element fixed in reflection so that said laser beam describes at least one reflection on each of the first and second diffractive optical elements in reflection, preferably at least two reflections on each of the first and second diffractive optical elements in reflection.
- At least two reflections of the source beam on two diffractive optical elements make it possible to have better control of the separation of the plurality of separate laser beams. Also, this allows for better control of the depth of field when the plurality of separated laser beams are then focused.
- this embodiment of the invention makes it possible to obtain a much greater depth of field in comparison with the depth of field obtained during a simple interaction of the beam with a diffractive optical element.
- the spatial shift unit is configured such that each shifted laser beam is able to describe a circle around their respective main propagation axes A, in a plane perpendicular thereto.
- the spatial shift unit is configured so that each shifted laser beam is able to describe one or more lines in a plane perpendicular to their respective main propagation axes A.
- the line (s) lie in a plane perpendicular to the main axes of propagation A, regardless of the orientation of this line (s) in this plane.
- the spatial shift unit is able to maintain the same polarization between said plurality of collimated laser beams and said plurality of shifted laser beams.
- the spatial shift unit is able to maintain the same polarization between the plurality of collimated laser beams and the plurality of shifted laser beams.
- This property of the spatial shift unit is particularly important because it makes it possible to be able to spatially shift laser beams separated by separation means that use the polarization of the light in order to separate them.
- this embodiment makes it possible to modify the spatial shift of separate laser beams not having a fixed polarization in time.
- said spatial shift unit comprises:
- first lateral shift unit for obtaining a laser beam shift in a first direction X in a plane perpendicular to said main propagation axis A; - a second lateral shift unit for obtaining a laser beam shift in a second direction Y in a plane perpendicular to said main propagation axis A; said X and Y directions being orthogonal to them; said first and said second lateral shift unit are optically coupled so that they are able to shift said plurality of collimated laser beams to obtain a plurality of shifted laser beams, each shifted laser beam being adapted to describe a circle around their axes main propagation axes A, in a plane perpendicular to their main propagation axes A.
- said first and / or said second lateral shift unit comprises a blade capable of being rotated so as to shift said plurality of collimated laser beams to obtain a collimated beam shift in an X direction and / or Y respectively in a plane perpendicular to said main axes of propagation A.
- said first and / or said second lateral shift unit comprises:
- an optical return system configured to redirect a first input reflection on said mobile mirror of the plurality of collimated laser beams towards said mobile mirror so as to obtain, for all the possible positions and orientations of said mobile mirror, an offset of each beam laser collimated in an X and / or Y direction respectively.
- the optical feedback system comprises:
- a first and a second fixed mirror configured so: o that a first input reflection of the plurality of laser beams collimated on said mobile mirror is directed towards said first fixed mirror, o that a second reflection on said first mirror fixed is directed towards said second fixed mirror, o that a third reflection on said second fixed mirror is directed towards said movable mirror, and, o that a fourth output reflection on said movable mirror, makes it possible to obtain, for all the possible positions and orientations of said movable mirror, an offset of each laser beam collimated in a first direction X or a second direction Y with respect to their respective main axes of propagation A.
- the first and the second lateral shift unit each comprise:
- a first mobile mirror so that its normal is able to describe a trajectory in a two-dimensional space
- a second mobile mirror so that its normal is able to describe a trajectory in a two-dimensional space; the normals of the first and second movable mirrors being parallel for all the possible positions and orientations of the first and second movable mirrors, and, the first and second movable mirrors being configured such that: a first input reflection of the plurality of laser beams collimated on said first movable mirror is directed towards said second movable mirror; a second reflection on said second mobile mirror makes it possible to obtain, for all the possible positions and orientations of said first and second mobile mirrors, a plurality of beams offset laterally in an X direction; a third reflection of said plurality of laterally shifted beams on said first movable mirror is directed towards said second movable mirror; that a fourth reflection on said second mobile mirror makes it possible to obtain, for all the possible positions and orientations of said first and second mobile mirrors of said first and second lateral shift unit, a plurality of shifted laser beams, each shifted laser beam being suitable in describing a circle
- the first and second lateral shift units are defined according to the embodiment defined in paragraph [0035] or according to the embodiment defined in paragraph [0036].
- the first and second lateral offset units are defined according to the embodiment defined in paragraph [0032]
- the lateral shift unit comprises:
- a second mobile mirror so that its normal is able to describe a trajectory in a two-dimensional space, and in that it comprises a plate positioned between said first and said second mobile mirror so that a first reflection on said first mirror movable is directed towards said second movable mirror passing through said blade.
- the spatial shift unit comprises:
- a first mobile mirror so that its normal is able to describe a trajectory in a three-dimensional space
- the spatial shift unit comprises:
- an optical return system configured to redirect a first reflection of said plurality of beams collimated on said mobile mirror, towards said mobile mirror so as to obtain, for all the possible positions and orientations of said mobile mirror, a plurality of offset laser beams, each beam spatially offset laser being able to describe a circle in a plane perpendicular to their respective main axes of propagation A.
- the optical return system is a retro-reflection system, preferably a retro-reflector.
- said spatial shift unit comprises:
- a mirror o having an essentially planar reflection surface defined by a normal to obtain a first plurality of reflected laser beams from said plurality of collimated laser beams, o mobile such that its normal is capable of describing a trajectory in a three-dimensional space ; said spatial shift unit being configured such that said plurality of collimated laser beams and said normal of said mirror are separated by an angle between 0 ° and 15 °, preferably between 0.01 ° and 10 °, preferably between 0, 1 ° and 8 ° and even more preferably between 0.1 ° and 3 °, for all the possible positions and orientations of said mobile mirror;
- a retro-reflection system o positioned relative to the mobile mirror to obtain, from the first plurality of reflected laser beams, a second plurality of laser beams incident to the mobile mirror for all the positions and orientations of said mobile mirror, to obtain the plurality of laser beam shifted from a reflection of the second plurality of laser beams incident on the mobile mirror, and able to provide the second plurality of laser beams incident on the mobile mirror, parallel to the first plurality of laser beams reflected for all possible positions and orientations of the mobile mirror.
- the optical device comprises a set of optical alignment and / or resizing of the source beam placed upstream of the optical matrix modulation means.
- a set of alignment and / or resizing optics allows optimum use of the separation means and in particular of the optical matrix modulation means and, for example, of an optical matrix beam modulator.
- the dimensions of the source laser beam make it possible to illuminate a large portion of the active surface of the optical matrix modulator.
- the dimensions of the source laser beam are smaller than the dimensions of the matrix optical beam modulator.
- the source laser beam has a diameter of between 5 mm and 10 mm on the matrix optical modulation means.
- the source laser beam makes it possible to illuminate more than 75% of the active surface of the optical matrix modulator, more preferably more than 80%.
- one of the aims of the present invention is to provide an optical system allowing rapid and high quality machining on the same part.
- an optical system for laser machining comprising:
- - Focusing means configured to focus each offset laser beam on a workpiece.
- the optical system of the invention further comprises a system for adjusting the collimation which makes it possible to adapt more easily. at different target thickness, sample.
- the laser source makes it possible to generate a coherent laser beam.
- the ultrashort pulse laser source is able to emit a collimated source beam having a fixed polarization over time.
- one of the aims of the present invention is to provide a method for generating laser beams allowing rapid and high quality machining on the same part.
- the inventors propose a method for providing a plurality of laser beams offset from a plurality of separate laser beams for machining a part and comprising the following steps: a. providing an ultrashort pulse laser source to generate a source laser beam; b. providing separation means controlled by a control unit; vs. providing a spatial shift unit and focusing means; d. controlling said separation means to separate a source laser beam into a plurality of separate laser beams, each of the separate laser beams being adapted to propagate along different propagation axes. e.
- each shifted laser beam is able to propagate around a main propagation axis A and is able in describing a movement around the main axis of propagation A f.
- focusing using the focusing means each laser beam shifted on a workpiece in the direction of its own propagation axis.
- the source laser beam is preferably a coherent laser beam.
- the source laser beam has a fixed polarization over time.
- the separation means are matrix modulation means, and even more preferably, matrix phase modulation means.
- the separation means comprise an array of pixels controlled to display a phase modulation map so that interaction of said source laser beam with said phase modulation pattern generates said plurality of separate laser beams.
- the modulation pattern is configured to separate the source laser beam into nine separate beams.
- - Fig.1 shows an embodiment of the device of the system according to the invention
- FIG. 2 shows an embodiment of the device of the system according to the invention
- FIG. 3 shows an embodiment of the system according to the invention
- FIG. 4a, 4b, 4c, 4d, 4e, 5a, 5b, 5c, 5d, 5e show embodiments of a spatial shift unit included in the device
- Figs. 6, 7A, 7B, 8A, 8B show embodiments of the separation means included in the device.
- the optical device 1 comprises separation means 30 making it possible to separate a source laser beam 101 into a plurality of separate laser beams 301.
- the source laser beam is preferably generated by a laser source 10.
- the beam laser source 101 is a collimated laser beam.
- the plurality of separated laser beams 301 is obtained by means of the separation means 30 which make it possible to separate the source laser beam 101 into a plurality of separate laser beams 301 in the direction of the spatial 50 or lateral shift unit 50x, 50y.
- the separation means 30 make it possible to maintain the collimated appearance of the plurality of separated laser beams 301.
- the plurality of laser beams 301 separated after their separation by the separation means 30 are not parallel to each other.
- the plurality of separated laser beams 301 after their separation by the separation means 30 are not parallel to the direction of propagation of the source laser beam 101.
- Figure 1 shows an optical device 1 comprising a lateral shift unit 50X, 50Y for obtaining from said plurality of separate laser beams 301, a plurality of laser beams shifted 501 in a linear translation in a plane perpendicular to said axis of main propagation A as indicated by the double arrow (the direction of which in the plane of the figure is given by way of example).
- Linear translation is obtained on either side of a main propagation axis A for each offset laser beam 501.
- Each laser beam is laterally offset in a direction around the main propagation axis A.
- Each offset laser beam describes a movement - for example along the double arrow - around the main axis of propagation A.
- each laser beam is along one or more lines in a plane perpendicular to the respective main axes of propagation A.
- the line (s) lie in a plane perpendicular to the main axes of propagation A, regardless of the orientation of this line (s) in this plane.
- Figure 2 shows an optical device 1 comprising a spatial shift unit 50 for obtaining from said plurality of separate laser beams 301, a plurality of shifted laser beams 501, each shifted laser beam being shifted in a circular translation in a plane perpendicular to said main axis of propagation A as indicated by the curved arrow.
- Each laser beam is laterally offset around the main propagation axis A.
- Each offset laser beam describes a movement along the curved arrow around the main propagation axis A. The movement of each laser beam is in a circle around their respective main axes of propagation A, in a plane perpendicular to them.
- FIG. 3 shows an embodiment of the system 100 of the invention.
- the optical machining system 100 comprises separation means 30 for separating (shaping) the source laser beam 101 into a plurality of separate laser beams 301.
- the source laser beam 101 being preferably collimated, the separation means 30 make it possible to maintain a acceptable collimation so that each of the separate laser beams of the plurality of separate laser beams 301 can be considered to be collimated.
- the plurality of separate laser beams 301 are then directed toward the spatial (lateral) shift unit 50 adapted to spatially (laterally) shift each of the plurality of separate beams 301.
- FIG. 3 is shown a spatial offset according to a circle in a plane perpendicular to a main propagation axis A.
- the particularity of this spatial (lateral) offset unit 50 is to allow conservation of the same polarization between the plurality of separate laser beams 301 and the plurality of offset laser beams 501.
- the machining optical system 100 also comprises focusing means 70 - preferably a single optical element common to all of the offset beams and preferably telecentric - for focusing the plurality of offset laser beams. on a workpiece 202, so that each offset laser beam is focused in the direction of its own propagation axis. Downstream of the focusing means 70, the angle between each of the offset laser beams and a normal of the upper surface of the workpiece is non-zero (or different from 0 °).
- the spatial shift preferably the rotational movement of each of the beams constituting the plurality of offset laser beams 501 around their own propagation axis, is generated by the spatial shift unit 50 upstream of the focusing means 70, this which makes it possible to have an angle of attack of the part and to produce a precession movement of each beam of the plurality of offset laser beams 501 downstream of the focusing means 70.
- the precession movement of each of the offset laser beams 501 is preferably produced at a point, a spot or a small area on a substrate 201 intended to be structured or machined.
- the system 100 comprises displacement means 160 making it possible to move at least one part or part 202 relatively with respect to the plurality of offset laser beams 501.
- the displacement means 160 make it possible for example to move the substrate in the directions 101, 102. and 103.
- the directions 101, 102 and 103 preferably defining a three-dimensional Cartesian coordinate system.
- the directions 101 and 102 defining for example an X direction and a Y direction.
- the Z direction 103 defines the direction of the main axis A and corresponds to a normal to the upper surface of the part.
- the plurality of offset laser beams 501 are focused by the focusing means 70, so that the angle of attack of the offset laser beams 501 on the workpiece 202 is not parallel to a normal of the upper surface. of the part 202. This therefore makes it possible to obtain very straight drilling or cutting faces or with a controlled taper.
- the system 100 of the invention makes it possible to machine very close positions on a (single) part to be machined 202.
- the focusing means 70 preferably a single optical element and preferably telecentric - focus the plurality of offset laser beams on the (single) part to be machined 202, so that each of the offset laser beams is focused in the direction of its own propagation axis. Downstream of the focusing means 70, the angle of attack between each of the offset laser beams and a normal of the upper surface of the workpiece is non-zero (or different from 0 °). The plurality of offset laser beams 501 are focused by the focusing means 70, so that the angle of attack of the offset laser beams 501 on the workpiece 202 to be machined is not parallel to a normal of the upper surface of the machine.
- the invention is particularly well suited to the structuring of a substrate with patterns having a negative taper, for example lines having a negative taper.
- Such lines having a negative taper are particularly advantageous for assembly applications by mechanical anchoring where a fusible material of a part to be assembled is then melted in the negative taper groove and then cooled in order to obtain a good mechanical anchoring.
- FIG. 4a shows one embodiment of a spatial (lateral) shift unit 50.
- the separated laser beam 301 in the lateral shift unit 50 is a laser beam generated by a laser source 10 and traveling from side to side. preferably outside the side shift unit 50 before entering it.
- the lateral shift unit 50 comprises a mirror 119 which enables to obtain a first laser beam reflected 123 by the reflection of the incident laser beam 14.
- the lateral shift unit 50 also comprises a retro-reflection system 121 which enables to obtain. redirecting the first reflected laser beam 123 onto the mirror 119.
- the second incident laser beam 18 in the direction of the mirror 119 is obtained by the passage of the first reflected laser beam 123 into the retro-reflection system 121.
- the second incident laser beam 18 is then reflected by mirror 119 and forms a plurality of offset laser beams 501.
- the lateral shift unit 50 is configured such that the shifted laser beam 501 can be spatially shifted relative to the separated laser beam 301 while remaining parallel to the direction of the separated laser beam 301 upstream of the focusing means. 70.
- the separated laser beam 301 and the shifted laser beam 501 are transversely shifted.
- the mirror 119 can perform a complete rotation around an axis of rotation 150 and drive means 16 allow the mirror 119 to be rotated about its axis of rotation 150.
- the lateral shift unit 50 is configured so that the first incident laser beam 301 and the normal 126 to the mirror 19 are separated by an angle 115 of between 0 ° and 15 ° for all the possible positions and orientation of the movable mirror 119. This angle 115 is not shown to scale in FIG. 4a for the sake of clarity of the figure.
- the spatial shift unit 50 is configured such that a change in position between the mirror 119 and the retro reflection system 121 allows to induce a variation in the offset between the separated laser beams 301 and shifted 501. In Figure 4a, depending on the angular position of the movable mirror 119, the offset laser beam 501 will follow a different path.
- each of the trajectories of the offset laser beam 501 obtained for each of the angular positions of the mobile mirror 119 are parallel.
- the optical machining system also comprises focusing means 70 for focusing each offset laser beam 501 after the lateral offset (around a main propagation axis A which is specific to it) of the plurality of beams offset 501 by the unit. spatial offset 50 on a part or a workpiece 201.
- each of the offset laser beams 501 makes it possible to producing the precession movement of the offset laser beam 501 downstream of the focusing means 70; downstream of the focusing means 70, each offset laser beam is focused on the workpiece in the direction of its own propagation axis.
- the precessional motion of each of the shifted laser beams 501 is preferably produced at a point, spot, or small area on a substrate 201 intended to be patterned or machined.
- the angle of attack of offset laser beams 501 on workpiece 202 is not parallel to a normal of the top surface of workpiece 202; this therefore makes it possible to obtain very straight drilling or cutting faces or with a controlled taper.
- the precession movement is illustrated in Figures 2, 3, 4a, 4b, 5a, 5b, 5c, 5d and 5e by arrows describing a portion of a circle.
- the movement of the offset laser beam 501 along a line (or more lines) is illustrated by a double arrow in FIG. 1, 4c, 4d, 4th.
- Figure 4b shows a spatial shift unit 50 for spatially shifting an incoming laser beam 301 (301 ') into a shifted laser beam 501 (501') having a main propagation axis A and capable of describing a circle in a plane perpendicular to this main axis of propagation A.
- This spatial shift unit 50 includes a first lateral shift unit 50X and a second lateral shift unit 50Y configured such that:
- the first 50X lateral shift unit makes it possible to shift the incoming beam 301 (301 ’) into a laterally shifted beam 302 (302’) in an X or Y direction in a plane perpendicular to the main propagation axis A, and,
- the second lateral shift unit 50Y makes it possible to shift the laterally shifted beam 302 (302 ') in the X or Y direction not shifted by the first lateral shift unit 50X into an shifted beam 501 (501') having a propagation axis principal A and capable of describing a circle in a plane perpendicular to this principal axis of propagation A.
- the laterally shifted beam 302 (302 ’) is able to move along a line in a plane perpendicular to this main propagation axis A.
- Figure 4c shows a (first or second) side shift unit 50X, 50Y comprising a blade 410 having a refractive index greater than air or vacuum.
- the blade 410 is tilted (i.e. orientable about an axis) so that for all of its orientations, the separate laser beams 301 or the laterally shifted beams 302 are transmitted by the blade 410.
- the blade 410 is switched from a first position to a second position, the separated laser beams 301 and / or the laterally shifted laser beams 302 are shifted laterally in a line, or in a circle if the beam 302 was already shifted in a line when it was passage in the blade 410.
- the tilt corresponds to tilting the blade 410 so that the separate laser beams 301 or the laterally shifted beams 302 have a varying angle of incidence on the blade 410.
- the rounded arrow schematically represents the trajectory of the tilt of the blade 410.
- the blade 410 in solid lines represents a first blade position and the blade 410 in broken lines represents a second position of the blade 410.
- the tilt of the blade 410. is generated between the first and second blade position 410.
- the split laser beams 301 or the laterally shifted laser beams 302 when shifted by the blade 410 to the first position are shown in solid lines and when shifted by the blade 410 in broken lines, are shown in broken lines.
- the main axis of propagation A is not shown.
- Figure 4d shows (first or second) lateral shift unit 50X, 50Y comprising a movable mirror 401 (the movable mirror is preferably tiltable, that is to say orientable about an axis), a first 402 and a second fixed mirror 403 configured such that: that a second reflection on the first fixed mirror 402 is directed towards the second fixed mirror 403, o that a third reflection on the second fixed mirror 403 is directed towards the movable mirror 401, and, o that a fourth output reflection on said movable mirror 401, makes it possible to obtain, for all the possible positions and orientations of the movable mirror, a laser beam 302, 501 in an X or Y direction, or X and Y respectively.
- the laser beams coming from the reflections on the mobile mirror 401 and the second 402 and third 403 mirrors are for example in the same plane.
- the orientations of the mirrors can be adjusted so as to modify the paths of the separate laser beams 301, or laterally offset 302 or offset 501.
- the main propagation axis A is not shown.
- Figure 4e shows a (first or second) lateral shift unit 50X, 50Y comprising a first movable mirror 421 X, 421 Y and a second movable mirror 422X, 422Y so that their normals are able to describe a trajectory in a two-dimensional space.
- the first 421 X, 421 Y and second 422X, 422Y movable mirrors are movable so that their surfaces or normals are always parallel.
- the movement of the first 421 X (421 Y) and second 422X (422Y) mobile mirrors is synchronized.
- the first 421 X (421 Y) and second 422X (422Y) movable mirrors are moved so that their respective surfaces are always parallel.
- the laterally offset beams 302, or offset 501 are always parallel to each other.
- the laterally offset laser beam 302, or offset 501 is obtained for all possible positions and orientations of said first 421 X (421 Y) and second 422X (422Y) movable mirrors.
- the beam shift obtained by the first 50X or the second 50Y lateral shift unit is preferably along a line, i.e. the movement or scanning of the laterally shifted laser beam 302 occurs along a line. line.
- the main axis of propagation A is not shown.
- Figure 5a shows an embodiment of a spatial shift unit 50 comprising a first 50X and a second 50Y lateral shift units as described in Fig. 4th.
- the separate laser beam 301 is laterally shifted by the first lateral shift unit 50X, into a laterally shifted beam 302.
- the laterally shifted beam 302 is shifted such that for all positions of the first 421 X and second 421 Y mirrors, the shifted beam laterally 302 sweeps a straight line. This straight line follows a first axis X in a plane perpendicular to the propagation of the laterally shifted beam 302.
- the laterally shifted beam 302 then enters a second lateral shift unit 50Y allowing it to be shifted in a second direction Y which has preferably not been shifted by the first lateral shift unit 50X.
- the laterally shifted beam 302 is then laterally shifted by the second lateral shift unit 50Y, into a spatially shifted beam 501 as a result of the reflection of the laterally shifted beam 302 on the first 421 Y and second 422Y movable mirrors of the second lateral shift unit 50Y.
- the spatially shifted beam 501 thus obtained can describe a circle in a plane perpendicular to the main propagation axis A (not shown), when the first 50X and second 50Y lateral offset units are coordinated in a coordinated fashion. This embodiment makes it possible to maintain the same polarization between the separated source laser beam 301 and the spatially shifted laser beam 501.
- Figure 5b shows an embodiment of a spatial shift unit 50 comprising a first movable mirror 431 and a second movable mirror 432 so that their normals are able to describe a trajectory in a three-dimensional space.
- the first 431 and second 432 movable mirrors are movable so that their surfaces or normals are always parallel.
- a separate incoming source beam 301 directed towards the first movable mirror 431 undergoes a first input reflection of the laser beam on said first movable mirror 431, this reflection is directed towards said second movable mirror 432, so that a second reflection on said second mobile mirror 432 makes it possible to obtain a spatially offset laser beam 501 having a main propagation axis A (not shown), said spatially offset laser beam 501 being able to describe a circle around the main axis A in a plane perpendicular to this main propagation axis A.
- the offset laser beam 501 is obtained for all the possible positions and orientations of said first 431 and second 432 mobile mirrors.
- the resulting beam shift preferably describes a circle, i.e.
- FIG. 5c shows an embodiment of a spatial shift unit 50 comprising the lateral displacement unit 50X, 50Y of Figure 4e in which, a tiltable blade 410 is inserted between the first 421 and second 422 mirrors movable (tiltables) - tiltable meaning orientable around an axis.
- first 421 and second 422 tiltable mirrors make it possible to move the laser beam in an X or Y direction
- the tiltable blade then makes it possible to move the same laser beam in a Y or X direction respectively.
- This configuration could be envisaged by positioning the blade 410 upstream of the first movable mirror 421 or downstream of the second movable mirror 422.
- the configuration shown in FIG. 5c is nevertheless particularly compact.
- the combination of the two movable mirrors (tiltable) 421, 422 and the movable blade (410) (tiltable) makes it possible to obtain a spatially shifted laser beam having a main propagation axis A (not shown) and being able to describe a circle around the main axis A in a plane perpendicular to this main propagation axis A, thanks to the synchronization of the movements of the first 421 and second 422 mobile mirrors and of the mobile blade 410.
- This embodiment makes it possible to maintain the same polarization between the source laser beam 101 at the input and the spatially shifted laser beam 501 at the output.
- the embodiment of FIG. 5c is a combination of the embodiments of Figs. 4c and 4th.
- Figure 5d shows an embodiment of a spatial shift unit 50 including an improvement of the side shift unit 50X, 50Y shown in Fig. 4c.
- the improvement lies in the setting in motion of the blade 410.
- the blade 410 is set in motion so that its normal describes a trajectory in three-dimensional space, for example such that its normal describes a circle.
- its normal describes a circle around an axis passing through the point of incidence of a separate beam 301 with the blade 410.
- the axis is not parallel to the separated beam 301, that is to say , not merged with the separated beam 301.
- Such an axis is represented by the dashed line.
- This embodiment of a spatial shift unit 50 which makes it possible to obtain a plurality of spatially shifted laser beams 501, having a main propagation axis A and being able to describe a circle around the main axis A in a plane perpendicular to this main axis of propagation A, in particular when the normal of the blade 410 describes a circular path around the axis.
- This embodiment makes it possible to maintain the same polarization between said source laser beam 101 and the spatially shifted laser beam 501.
- Figure 5e shows an embodiment of a spatial shift unit 50 comprising a first wedge prism 441 and a second wedge prism 442, each of the two wedge prisms 441, 442 being able to be rotated around an axis as shown in FIG. 5th.
- the two wedge prisms 441, 442 are rotated synchronously. Preferably, they are rotated so that the sum of their thicknesses at any point in a direction parallel to their axis of rotation is equal.
- the two wedge prisms 441, 442 have identical wedge prism angles.
- the passage of the laser beam through the two wedge prisms 441, 442 during their synchronized rotations makes it possible to obtain a spatially shifted laser beam 501 having a main propagation axis A and being able to describe a circle around the main axis A in a plane perpendicular to this main propagation axis A.
- This embodiment makes it possible to maintain the same polarization between the separated laser beam 301 at the input and the spatially shifted laser beam 501 at the output.
- Figure 6 shows separation means 30 comprising a first reflective diffractive optical element 37 and a second reflective diffractive optical element 38.
- the first 37 and the second 38 reflective diffractive optical elements each comprise a diffraction grating for diffract a laser beam in reflection.
- the source laser beam 101 is directed towards the diffraction grating of the first diffractive optical element 37 in reflection, the diffracted and reflected beam is then directed towards the second optical element in reflection 38 where it is again diffracted and reflected in a plurality of beams.
- separate laser 301 In another embodiment of the separation means of FIG.
- the source laser beam 101 is reflected and diffracted at least twice on each of the first 37 and second 38 reflective diffractive optical elements so that a plurality of separate laser beams 301 are generated by the separation means 30. At least two reflections of the source beam 101 allow better control of the separation of the plurality of separate laser beams 301, and, in particular, better control of the depth of field when the plurality of separate laser beams 301 is then focused.
- FIG. 7A shows separation means 30 comprising a transmission diffractive optical element 36.
- a transmission diffractive element 36 comprises a diffraction grating on at least one of its surfaces.
- a transmission diffractive element 36 is made of a material transparent to the source laser beam 101.
- the transmission diffractive element 36 allows the source laser beam 101 to be diffracted into a plurality of separate laser beams 301.
- Each of the beams of the plurality of separate laser beams 301 then propagating in a direction which is specific to them. For example, two separate laser beams have directions which describe an angle ⁇ between them.
- FIG. 7B shows separation means 30 comprising a reflection diffractive optical element 37.
- a reflection diffractive element 37 comprises a diffraction grating on its reflection surface.
- the reflective diffractive element 37 makes it possible to diffract the source laser beam 101 into a plurality of separate laser beams 301.
- Each of the beams of the plurality of separate laser beams 301 then propagates in a direction of their own. For example, two separate laser beams have directions which describe an angle ⁇ between them.
- FIG. 8A shows separation means 30 comprising transmission matrix modulation means 35.
- Transmission matrix modulation means 35 comprise a matrix of pixels capable of being traversed by the source laser beam 101.
- the pixel matrix is configured to display a phase modulation map (a diffractive pattern) making it possible to diffract the beam.
- laser source 101 during the transmission thereof through the displayed phase modulation map, in a plurality of separate laser beams 301.
- Each of the beams of the plurality of separate laser beams 301 then propagate in a direction which is theirs. is clean.
- two separate laser beams have directions which describe an angle ⁇ between them.
- FIG. 8B shows separation means 30 comprising reflection matrix modulation means 39.
- Reflection matrix modulation means 39 comprise a pixel matrix making it possible to reflect the source laser beam 101.
- the pixel matrix is configured to display a phase modulation map (a diffractive pattern) making it possible to diffract the laser beam.
- source 101 during the reflection thereof on the displayed phase modulation map, in a plurality of separate laser beams 301.
- Each of the beams of the plurality of separate laser beams 301 then propagate in a direction which is specific to them.
- two separate laser beams have directions which describe an angle ⁇ between them.
- the present invention is not limited to the examples illustrated and / or described above.
- the use of the verbs "to understand”, “to include”, “to include”, or any other variant, as well as their conjugations, can in no way exclude the presence of elements other than those mentioned.
- the use of the indefinite article “a”, “a”, or of the definite article “the”, “the” or “”, to introduce an element does not exclude the presence of a plurality of these elements . Reference numbers in the claims do not limit their scope.
- the laser machining optical system according to the invention makes it possible to machine several patterns simultaneously on the same part more simply and more robustly.
- the system includes
- an ultrashort pulse laser source 10 for generating a source laser beam 101
- Focusing means 70 configured to focus each laser beam shifted on a workpiece 201 in the direction of its own propagation axis.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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BE20205275A BE1027700B1 (en) | 2020-04-24 | 2020-04-24 | Device for a laser machining optical system |
PCT/EP2021/059978 WO2021213938A1 (en) | 2020-04-24 | 2021-04-16 | Optical system for laser machining |
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EP4139079A1 true EP4139079A1 (en) | 2023-03-01 |
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EP21719905.8A Pending EP4139079A1 (en) | 2020-04-24 | 2021-04-16 | Optical system for laser machining |
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US (1) | US20230150062A1 (en) |
EP (1) | EP4139079A1 (en) |
JP (1) | JP2023521963A (en) |
KR (1) | KR20230003062A (en) |
BE (1) | BE1027700B1 (en) |
WO (1) | WO2021213938A1 (en) |
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WO2002101888A2 (en) * | 2001-06-13 | 2002-12-19 | Orbotech Ltd. | Multi-beam micro-machining system and method |
CN101861228B (en) * | 2007-11-14 | 2013-09-11 | 浜松光子学株式会社 | Laser machining device and laser machining method |
DE102014200633B3 (en) | 2014-01-15 | 2015-05-07 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Machining apparatus and method for laser processing a surface |
BE1026484B1 (en) * | 2018-07-24 | 2020-02-25 | Laser Eng Applications | Optical method and device for providing two offset laser beams |
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2020
- 2020-04-24 BE BE20205275A patent/BE1027700B1/en active IP Right Grant
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2021
- 2021-04-16 EP EP21719905.8A patent/EP4139079A1/en active Pending
- 2021-04-16 WO PCT/EP2021/059978 patent/WO2021213938A1/en unknown
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US20230150062A1 (en) | 2023-05-18 |
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BE1027700B1 (en) | 2021-05-18 |
WO2021213938A1 (en) | 2021-10-28 |
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