WO2023094037A1 - Vorrichtung zur formung einer laserstrahlung - Google Patents
Vorrichtung zur formung einer laserstrahlung Download PDFInfo
- Publication number
- WO2023094037A1 WO2023094037A1 PCT/EP2022/067875 EP2022067875W WO2023094037A1 WO 2023094037 A1 WO2023094037 A1 WO 2023094037A1 EP 2022067875 W EP2022067875 W EP 2022067875W WO 2023094037 A1 WO2023094037 A1 WO 2023094037A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- array
- lenses
- laser radiation
- laser
- prisms
- Prior art date
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 86
- 238000007493 shaping process Methods 0.000 title claims abstract description 15
- 238000003491 array Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Classifications
-
- 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
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
-
- 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
Definitions
- the present invention relates to a device for shaping laser radiation, in particular for shaping a linear intensity distribution of laser radiation, according to the preamble of claim 1 and a laser device for generating an intensity distribution of laser radiation in a working plane, in particular for generating a linear intensity distribution of laser radiation in a working plane, according to the preamble of claim 13.
- the length L of the line-shaped intensity distribution results from the following relationship: where p is the pitch of the lenses of the arrays arranged side by side, fn is the focal length of the lenses of the second array and fp is the effective focal length of the Fourier lens behind the second homogenizer.
- a device and a laser device of the type mentioned are known from DE 10 2007 026 730 A1.
- the device described therein comprises a first homogenizer stage with an array of lenses and a second homogenizer stage with two substrates, on each of which an array of lenses is arranged.
- a lens is also provided, which consists of the second Homogenizer stage exited partial radiation superimposed in a working plane, so that there is a linear intensity distribution of the laser radiation.
- the two substrates of the second homogenizer stage can be moved relative to one another, so that different distances can be realized in the direction of light propagation.
- the optical effectiveness of the device and the homogeneity of the intensity distribution in the working plane are impaired by the two mutually movable substrates of the second homogenizer stage.
- the present invention is based on the problem of creating a device of the type mentioned at the outset, with which greater optical effectiveness of the device and/or better homogeneity of the intensity distribution in the working plane can be achieved. Furthermore, a laser device with such a device is to be specified.
- the device comprises a first prism and a second prism, which are arranged between the second homogenizer and the lens device, wherein the device is set up so that the laser radiation passed through the second array of lenses successively through the first and passing through the second prism before impinging on the lens device. Inserting two prisms between the second homogenizer and the lens device has little or no effect on the optical effectiveness of the device and the homogeneity of the intensity distribution generated in the working plane.
- the prisms are set up to at least partially reduce or increase the cross section and/or the divergence of the laser radiation passing through them in a first direction, in particular with the increase in divergence increasing the length of the linear igen intensity distribution and by reducing the divergence a reduction in the length of linienförm igen intensity distribution is achieved.
- the linear intensity distribution extends in the first direction.
- the prisms can be set up to change the divergence of the laser radiation passing through them, at least partially in the first direction, by a factor of between 0.5 and 2.0, in particular thereby increasing the length of the linear intensity distribution by a factor of between 0.5 and 2.0 is changed.
- the prisms can therefore influence the shape of the intensity distribution over a comparatively large area, in particular the length of a laser line generated in the working plane.
- the lenses of the first array and of the second array can be arranged next to one another, in particular with the direction in which the lenses of the first array and of the second array are arranged next to one another corresponding to the first direction.
- the lenses of the first array and of the second array can be cylindrical lenses, the cylinder axes of which are aligned parallel to one another, in particular the cylinder axes extend in a second direction that is perpendicular to the first direction.
- the lenses can contribute to homogenization in the longitudinal direction of the line. Provision can be made to provide further cylindrical lenses in the HomogenisiereTM for the line transverse direction perpendicular thereto, the cylindrical axes of which extend in the first direction.
- the first prism prefferably be arranged in the device in such a way that partial radiations of the laser radiation which have passed through lenses of the second array arranged next to one another are not yet overlapping at least in the first direction when they enter the first prism. In this way, the partial beams that have passed through individual lenses can be formed separately from one another by the prisms.
- the movement, in particular the pivoting, of the at least one prism can change the factor by which the cross section of the laser radiation passing through the prism is changed.
- the axis about which at least one of the prisms, preferably both prisms, can be pivoted extends in the second direction.
- the two prisms can have the same design, in particular to have the same size and/or the same shape.
- Such a design allows the manufacturing costs of the device to be reduced.
- the distance between the lenses of the first array and the lenses of the second array corresponds to the focal length of at least some lenses, preferably all lenses, of the second array.
- the lens device can be positioned in the device in a Fourier arrangement, so that a distribution of the laser radiation in angular space between the second array and the lens device is converted by the lens device into an intensity distribution in spatial space.
- the device for shaping a laser radiation is a device according to the invention.
- the laser device can include two laser light sources that are set up to generate laser radiation with properties that differ from one another, for example with divergences or beam profiles that differ from one another, with the laser device being set up so that the laser radiation hits the laser beams adjacent to one another Device impinge and the lens device superimposed both laser beams in the working plane, superimposed in particular in the intensity distribution linienförm strength. It has proven to be very advantageous that a single lens device in a Fourier arrangement superimposes two possibly very different laser beams in a working plane, in particular in a line-shaped intensity distribution in the working plane, while at the same time the length of the line can be specified by a corresponding position of the prisms.
- the device for shaping a laser beam comprises four prisms, two of which are provided for one of the different laser beams.
- Forming a laser radiation comprises two prisms, which are provided for both of the different laser radiation.
- FIG. 1 shows a schematic side view of a first embodiment of a device according to the invention with drawn-in beams of a laser radiation to be shaped;
- 2a shows two diagrams which schematically illustrate the distribution of the laser radiation behind the second homogenizer in the spatial space and in the angular space;
- 2b shows two diagrams which schematically illustrate the distribution of the laser radiation behind the second prism in spatial space and in angular space in a first position of the two prisms;
- 2c shows two diagrams which schematically illustrate the distribution of the laser radiation behind the second prism in spatial space and in angular space in a second position of the two prisms;
- FIG. 3a shows a schematic side view of the embodiment according to FIG. 1 in a first position of the two prisms
- FIG. 3b shows a diagram in which the intensity of the laser radiation in the working plane is plotted in arbitrary units against the spatial coordinates in the longitudinal direction of the line of the linear intensity distribution in mm, with the two prisms being in the first position shown in FIG. 3a;
- FIG. 4a shows a schematic side view of the embodiment according to FIG. 1 in a second position of the two prisms;
- FIG. 4b shows a diagram in which the intensity of the laser radiation in the working plane is plotted in arbitrary units against the spatial coordinates in the longitudinal direction of the line of the linear intensity distribution in mm, with the two prisms being in the second position shown in FIG. 4a;
- FIG. 5 shows a schematic side view of a second embodiment of a device according to the invention with drawn-in beams of a laser radiation to be shaped.
- the embodiment of the device for shaping laser radiation shown in FIG. 1 comprises, in a manner known per se, a first homogenizer 1 with a first array 2 of lenses 3 and a second homogenizer 4 with a second array 5 of lenses 6.
- the device is set up so that a laser radiation 7 to be shaped passes through the first array 2 of lenses 3 and the second array 5 of lenses 6 in succession.
- the lenses 3, 6 are arranged side by side in a first direction x.
- the lenses 3, 6 are cylindrical lenses, the cylinder axes of which extend in a direction y perpendicular to the first direction x, the second direction y extending out of the plane of FIG.
- the lenses 3, 6 therefore act in the first direction x.
- the laser radiation 7 essentially moves in a third direction Direction z, which is perpendicular to the first and the second direction x, y.
- the first array 2 is arranged on the exit surface of the first homogenizer 1 and the second array 5 is arranged on the entry surface of the second homogenizer 4 . It is certainly possible to arrange both arrays 2 , 5 on the entry surfaces or the exit surfaces or to arrange the first array 2 on the entry surface of the first homogenizer 1 and the second array 5 on the exit surface of the second homogenizer 4 . Furthermore, it can also be provided that only a single transparent substrate is provided, on the entry surface of which the first array 2 is arranged and on the exit surface of which the second array 5 is arranged.
- arrays of lenses that act in the second direction y are arranged on the entry surface of the first homogenizer 1 and/or the exit surface of the second homogenizer 4 .
- these can be cylinder lenses whose cylinder axes extend in the first direction x.
- All lenses 6 of the second array 5 have the same focal length.
- the distance between the two arrays 2, 5 from one another is equal to the focal length of the lenses 6 of the second array 5.
- the device shown in FIG. 1 further comprises, in a manner known per se, a lens device 8, which is shown in FIG Embodiment is designed as a plano-convex lens 8 in a Fourier arrangement.
- the lens device 8 superimposes, in a manner known per se, the partial radiations of the laser radiation 7 emanating from the lenses 6 of the second array 5 in a working plane (not shown) in the first direction x. In this case, a distribution of the laser radiation in angular space is converted into a distribution in local space in the working plane.
- lens system can also be provided instead of a single lens.
- the device shown in FIG. 1 also comprises two prisms 9, 10 between the second homogenizer 4 and the lens arrangement 8, through which the laser radiation 7 passes in succession.
- the prisms 9, 10 have the same size and the same shape, with the cross section seen in FIG. 1 continuing into the plane of the drawing in FIG.
- the first prism 9 on the left in Fig. 1 is arranged in such a way that when the laser radiation 7 impinges on the entry surface 11 of the first prism 9, the partial radiations of the laser radiation 7 that have passed through lenses 6 of the second array 5 arranged next to one another in the first direction x are not yet overlapped with each other.
- Din is the extent of the partial radiation entering the prisms 9, 10 in the first direction x in spatial space, is the extent of the partial radiation entering the prisms 9, 10 in the first direction x in angular space,
- Dout is the extent of the partial radiation exiting from the prisms 9, 10 in the first direction x in spatial space, and out is the extent of the partial radiation exiting from the prisms 9, 10 in the first direction x in angular space.
- 2a shows the cross-section 12a or the extent Din of the partial radiation entering the prisms 9, 10 in the first direction x in the spatial domain.
- 2a shows the divergence 13a or the expansion in the partial radiation entering the prisms 9, 10 in the first direction x in the angular space.
- FIG. 2b and FIG. 2b illustrate the effect of two different positions of the prisms 9, 10 on the partial radiation emerging from the prisms.
- 2b shows the cross section 12b or the extent Dout of the partial radiation emerging from the prisms 9, 10 in the first direction x in the spatial domain.
- 2b shows the divergence 13b or the expansion out of the partial radiation emerging from the prisms 9, 10 in the first direction x in the angular space. It turns out that the divergence 13b is smaller than the divergence 13a.
- the smaller divergence 13b or the smaller extent in Angular space is converted by the lens device 8 into a distribution in spatial space in the working plane, so that a smaller expansion of a field in the working plane in the first direction x, in particular a smaller length of the linear intensity distribution, results.
- 2c shows the cross section 12c or the extent Dout of the partial radiation emerging from the prisms 9, 10 in the first direction x in the spatial domain.
- 2c shows the divergence 13c or the expansion out of the partial radiation emerging from the prisms 9, 10 in the first direction x in the angular space. It turns out that the divergence 13c is greater than the divergence 13a.
- the greater divergence 13c or the greater extension in the angular space is converted by the lens device 8 into a distribution in the spatial space in the working plane, so that a greater extension of a field in the working plane in the first direction x, in particular a greater length of the linear intensity distribution results.
- FIGS. 3a to 4b This is illustrated in FIGS. 3a to 4b using the specific exemplary embodiment of a device for forming a line-shaped intensity distribution 14 of a laser radiation in a working plane.
- FIG. 3a shows a device in which the prisms 9, 10 are in a first position. In this first position, the length of the linear intensity distribution 14 is somewhat greater than 700 mm, as can be seen from FIG. 3b.
- Fig. 4a shows the same device as in Fig. 3a. However, the prisms 9, 10 in FIG. 4a are in a second position, which differs from the first position. At this second position, the length of the linear intensity distribution 14 is about 500 mm, as can be seen from FIG. 4b.
- the different positions of the prisms 9, 10 can be achieved by pivoting the individual prisms 9, 10 about an axis which extends in the second direction y.
- the first prism 9 in FIG. 4a is pivoted clockwise relative to the prism 9 in FIG. 3a about a corresponding axis extending in the second direction y.
- the second prism 10 in FIG. 4a is pivoted counterclockwise relative to the prism 9 in FIG. 3a about a corresponding axis extending in the second direction y.
- FIG. 5 shows an embodiment of a device according to the invention, which differs from that in FIG. 1 in that instead of two prisms 9, 10, four prisms 9a, 9b, 10a, 10b are provided.
- two first prisms 9a, 9b are arranged next to one another in the first direction x.
- two second prisms 10a, 10b are arranged side by side in the first direction x.
- Two laser beams 7a, 7b impinge on the device, which differ from one another, for example, in terms of their divergence or their beam profile.
- the first laser radiation 7a strikes the upper region of the first homogenizer 1 in FIG. 5, whereas the second laser radiation 7b strikes the lower region of the first homogenizer 1 in FIG.
- the device is set up so that the laser radiation 7a that has passed through the upper first prism 9a in FIG. 5 then passes through the upper second prism 10a in FIG
- Laser radiation 7b that has passed through prism 9b then passes through second prism 10b, which is lower in FIG.
- the device is set up so that the two laser beams 7a, 7b passed through the second prisms 10a, 10b pass together through the lens device 8 and are superimposed by it in the working plane, in particular in the linear intensity distribution.
- a single lens device 8 in a Fourier arrangement superimposes two possibly very different laser beams 7a, 7b in a working plane, in particular in a linear intensity distribution in the working plane, while at the same time the corresponding positions of the prisms 9a, 9b, 10a , 10b the length of the line can be specified.
- the device for forming two different laser beams 7a, 7b does not comprise four prisms but only two prisms, not shown, which are provided in this case for both of the mutually different laser beams 7a, 7b.
- FIGS. 1, 3a, 4a and 5 further lenses for focusing the laser radiation or the laser radiations in the working plane and/or for shaping the laser radiation or the laser radiations with regard to the second direction y provided are. These may not be shown for reasons of clarity.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laser Beam Processing (AREA)
- Optical Elements Other Than Lenses (AREA)
- Lenses (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020237028718A KR20230128406A (ko) | 2021-11-23 | 2022-06-29 | 레이저 방사를 성형하기 위한 디바이스 |
CN202280013626.9A CN116888522A (zh) | 2021-11-23 | 2022-06-29 | 激光光束整形装置 |
JP2023566759A JP2024517186A (ja) | 2021-11-23 | 2022-06-29 | レーザ輻射整形装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021130604.3A DE102021130604B3 (de) | 2021-11-23 | 2021-11-23 | Vorrichtung zur Formung einer Laserstrahlung und Laservorrichtung |
DE102021130604.3 | 2021-11-23 |
Publications (1)
Publication Number | Publication Date |
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WO2023094037A1 true WO2023094037A1 (de) | 2023-06-01 |
Family
ID=82361402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2022/067875 WO2023094037A1 (de) | 2021-11-23 | 2022-06-29 | Vorrichtung zur formung einer laserstrahlung |
Country Status (5)
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JP (1) | JP2024517186A (de) |
KR (1) | KR20230128406A (de) |
CN (1) | CN116888522A (de) |
DE (1) | DE102021130604B3 (de) |
WO (1) | WO2023094037A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007026730A1 (de) | 2006-06-10 | 2007-12-20 | Hentze-Lissotschenko Patentverwaltungs Gmbh & Co. Kg | Vorrichtung zur Erzeugung einer homogenen Winkelverteilung einer Laserstrahlung |
US20190258067A1 (en) * | 2018-02-21 | 2019-08-22 | Ricoh Company, Ltd. | Light illumination device, light processing apparatus using light illumination device, light illumination method, and light processing method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008033358B4 (de) | 2007-07-19 | 2014-04-03 | Coherent Gmbh | Vorrichtung und Verfahren zur Umverteilung des Strahlparameter-Produktes eines Laserstrahls |
DE102008017947A1 (de) | 2008-04-09 | 2009-10-15 | Limo Patentverwaltung Gmbh & Co. Kg | Vorrichtung, Anordnung und Verfahren zur Homogenisierung zumindest teilweise kohärenten Laserlichts |
DE102015108422A1 (de) | 2015-05-28 | 2016-12-01 | Hochschule Darmstadt | Strahlenoptisches System |
-
2021
- 2021-11-23 DE DE102021130604.3A patent/DE102021130604B3/de active Active
-
2022
- 2022-06-29 JP JP2023566759A patent/JP2024517186A/ja active Pending
- 2022-06-29 CN CN202280013626.9A patent/CN116888522A/zh active Pending
- 2022-06-29 WO PCT/EP2022/067875 patent/WO2023094037A1/de active Application Filing
- 2022-06-29 KR KR1020237028718A patent/KR20230128406A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007026730A1 (de) | 2006-06-10 | 2007-12-20 | Hentze-Lissotschenko Patentverwaltungs Gmbh & Co. Kg | Vorrichtung zur Erzeugung einer homogenen Winkelverteilung einer Laserstrahlung |
US20190258067A1 (en) * | 2018-02-21 | 2019-08-22 | Ricoh Company, Ltd. | Light illumination device, light processing apparatus using light illumination device, light illumination method, and light processing method |
Also Published As
Publication number | Publication date |
---|---|
KR20230128406A (ko) | 2023-09-04 |
JP2024517186A (ja) | 2024-04-19 |
DE102021130604B3 (de) | 2023-03-09 |
CN116888522A (zh) | 2023-10-13 |
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