EP4523300A1 - Verfahren zur montage, justierung und fixierung eines elektromagnetische strahlung emittierenden elements in bezug zu mindestens einem die emittierte elektromagnetische strahlung strahlformenden optischen element - Google Patents
Verfahren zur montage, justierung und fixierung eines elektromagnetische strahlung emittierenden elements in bezug zu mindestens einem die emittierte elektromagnetische strahlung strahlformenden optischen elementInfo
- Publication number
- EP4523300A1 EP4523300A1 EP23727816.3A EP23727816A EP4523300A1 EP 4523300 A1 EP4523300 A1 EP 4523300A1 EP 23727816 A EP23727816 A EP 23727816A EP 4523300 A1 EP4523300 A1 EP 4523300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- optical element
- electromagnetic radiation
- emitting element
- axis
- 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
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
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02253—Out-coupling of light using lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
-
- 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
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/003—Alignment of optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/02208—Mountings; Housings characterised by the shape of the housings
- H01S5/02212—Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
Definitions
- the invention relates to a method for assembling, adjusting and fixing an element emitting electromagnetic radiation in relation to at least one beam-forming element that forms the emitted electromagnetic radiation optical element in a common version.
- the invention can be used in all areas of application in which electromagnetic radiation is to be emitted with emitting elements, such as in particular laser diodes of small and medium power (in particular ⁇ 100 W), and these are mounted in such a way that mechanical surfaces for external contour processing according to a proposed process sequence are available. This applies in particular to all such emitting elements and their applications in TO housing shapes.
- the invention can be extended to other housing shapes and even multi-emitter laser diodes as well as other active components, such as glass fibers and LEDs.
- Semiconductor laser diodes are extremely widely used components for providing coherent light in various wavelength ranges and power classes.
- the semiconductor as the emitter of the laser radiation usually has strongly divergent radiation characteristics.
- the most common task when integrating semiconductor lasers is therefore to collimate the divergent light from the emitter using a suitable optical component or a combination of several optical components. This represents a basic requirement for further individual adaptation of the beam parameters to the function of the respective optical system.
- the electromagnetic radiation can also be influenced in other ways and certain beam cross-sectional geometries can be used with at least one correspondingly designed optical element.
- one or more optical components are used in up to five degrees of freedom (DOF) - lx translation along the optical axis (focus), 2x translation perpendicular to the optical axis (pointing and aberrations ) and 2x rotation perpendicular to the optical axis (aberrations) - adjusted in front of an emitting element, with the following adjustment goals being sought: i) alignment of the optical axis of the optical component coaxially to the center axis of the emission of the emitting element, and then ii) an adjustment of a defined Distance of the at least one beam-forming element to emitting element, whereby the position reached after the adjustment must then be fixed.
- DOF degrees of freedom
- the technical problem here is that the adjustment in up to five degrees of freedom is complex and often has to be carried out with an accuracy in the range of a few micrometers and better.
- the adjustment state achieved is fixed by gluing, particularly in the case of miniaturized laser assemblies, whereby the adhesive can bridge the variable adjustment gaps created by the 5 DOF adjustment. This represents a major challenge. It is very difficult to make such bonds permanently stable and reproducible.
- the adjustment of the optical component with respect to the emitting element is usually carried out in 5DOF with the help of suitable positioning systems (e.g. hexapods) under active observation of the collimated beam profile of the emitted electromagnetic radiation, e.g. using an element for checking the beam profile (beam profiler) of the beam with the emitting element emitted electromagnetic radiation.
- suitable positioning systems e.g. hexapods
- the assembly unit on which the optical component is fixed after the adjustment is designed in such a way that a sufficient adjustment range is available in order to exclude a collision between the optical component and the assembly unit and thus a restriction of the adjustment range during the adjustment.
- the adjustment range must be made as small as possible in order to minimize as far as possible the maximum adjustment gaps that occur in extreme adjustment conditions.
- animal elements in connection with at least one element designed for beam shaping in relation to each other, with which a very precise alignment of the at least one optical element in relation to the emitting element can be achieved permanently and safely.
- a beam-forming optical element or an optical reference element with the same optical properties, such as the beam-forming optical element, which can be enclosed by a housing on its radially outer edge, is aligned and fixed coaxially to the axis of rotation of a spindle of a machine tool.
- This can be achieved, for example, by means of an adjustable first clamping device arranged on the spindle.
- a second step ii) the electromagnetic radiation emitting element, which is enclosed by a housing on its radially outer edge and at least partially on the surface opposite the surface from which electromagnetic radiation is emitted, is converted into an independent of the “first” clamping device adjustable "second” clamping device of the spindle of the machine tool is inserted and fixed.
- the emitting element is aligned in up to five degrees of freedom so that the optical axis of the electromagnetic radiation emitted by the emitting element has been aligned coaxially with the axis of rotation of the spindle.
- a third step iii) the housing of the emitting element on its radially outer wall and on the surface as well as the surface that points in the direction of the at least one beam-forming optical element in the mounted and fixed state, in the second adjustable clamping device im Step ii) the position and alignment achieved are machined in the machine tool, so that the surface of the radially outer wall is parallel and the surface, which in the assembled and fixed state points in the direction of the at least one beam-forming optical element, is at least partially (partially) perpendicular to the Axis of rotation of the rotary spindle are aligned.
- a fourth step iv) carried out thereafter the at least one beam-forming optical element processed by means of adjustment turning or adjustment grinding and the emitting element are introduced into a common socket in such a way that their radially outer walls are aligned parallel to one another and on the rotationally symmetrical inner wall of the socket as well as perpendicularly Surfaces aligned with the optical axes of the at least one beam-forming optical element and the housing of the emitting element, which are arranged facing one another and lie against one another.
- the alignment and positioning of the at least one beam-forming optical element should also take place in five degrees of freedom, which will be discussed below.
- an adjustment turning can be carried out directly on the at least one beam-forming optical element or on a housing in which the at least one beam-forming optical element is enclosed, on its radially outer wall and on the surface, which is in the assembled state towards the emitting element has, be carried out so that the radially outer wall is parallel and the surface, which in the mounted state points in the direction of the emitting element, is aligned perpendicular to the optical axis of the at least one beam-forming optical element and the second step ii) or the fourth step iv ) is carried out immediately afterwards.
- the surface of a housing in which the beam-forming optical element is arranged which in the assembled state points in the direction of the emitting element and is aligned perpendicular to the optical axis of the at least one beam-forming optical element, should be or have been arranged in a plane that has a defined distance in the mounted and fixed state to the emitting element, taking into account its focal length (s), several beam-forming optical elements that are arranged in a row arrangement.
- the emitting element and the beam-forming optical element(s) can then be positioned exactly within the common mount in a defined relationship to one another, as far as the alignment of their optical axes and also the distance between them is concerned.
- surfaces aligned perpendicular to the respective optical axis are only partially obtained on a surface by machining, these can be formed, for example, as a stepped annular region that projects beyond one or more other surface regions.
- At least one of the electrical magnetic radiation collimating beam-forming element can be rotated by at least 360 ° about its optical axis. This should be done at least once.
- the rotational movement can also be carried out as often as necessary until the alignment of the optical axis of the at least one beam-forming optical element has been achieved coaxially with the axis of rotation of the respective spindle.
- the alignment of the at least one beam-forming optical element can be carried out by means of reflex image capture and reversal testing in the first adjustable clamping device.
- the beam-forming optical element(s) have an alignment-turned or ground flat surface P on the respective housing in the direction of the emitting element, which in the adjusted, mounted and fixed state is directly on the corresponding one Surface of the housing in which the emitting element rests is arranged.
- Beam-shaping optical elements with such properties can be produced easily and economically using the classic process of alignment turning or grinding of passive optical components.
- Such a “reference” lens as a beam-shaping optical element (which does not necessarily have to be adjusted in the first step, but must have the same optical properties as a beam-shaping optical element that is actually to be installed later, for example a Colli mation lens.
- a “reference” lens can initially be used in a setup very similar to adjustment turning, whereby the setup should have at least one rotatable spindle of a precision machine tool.
- a useful variant is shown in Figure 1.
- the reference lens is placed on the Turning spindle of a lathe is placed in a clamping device, in particular an adjusting chuck, and can be subjected to a reversal test using a reflex image measuring device.
- the reference lens is aligned coaxially with the rotating spindle axis.
- This can be carried out, for example, in the arrangement shown in Figure 1 by means of the adjusting chuck of the reference lens and by means of a reversal test (i.e. observation of the reflex image of the respective lens surface while the rotary spindle including the reference lens is rotated through 360°).
- an emitting element with an adjustable housing is present.
- This can, in combination with, for example, an adjustment-turned collimation lens as a beam-shaping element, be easily inserted into a precision tube mount ( Figure 6) without complex adjustment and aligned exactly with one another and fixed without an adhesive.
- a precision tube mount Figure 6
- several beam-forming optical elements can also be arranged one above the other, which lie against one another, so that in particular respective focal lengths can be taken into account by maintaining defined distances.
- focal point levels can also be adjusted.
- Figure 1 shows in schematic form a structure that can be used when carrying out the first step i);
- Figure 2 shows in schematic form a structure that can be used when carrying out the second step ii);
- Figure 3 shows in schematic form how a laser diode can be processed as an emitting element by adjusting turning
- Figure 4 shows a beam-shaping optical element that is to be processed on certain surfaces by adjusting rotation
- Figure 5 is intended to process a housing of a laser diode as an emitting element on certain surfaces and
- Figure 6 shows a beam-forming optical element and an emitting element, which is arranged in a common socket after carrying out the method and is adjusted in relation to one another so that the optical axes of the beam-forming element and the emitting element match.
- Figure 1 is intended to illustrate how the first step i) of the method can be carried out.
- An optical reference element 2 'with the same optical properties as a beam-shaping optical element 2 is inserted and fixed in an adjustable first clamping device 4 of a rotatable spindle 5 of a lathe.
- the spindle 5 By rotating the spindle 5, as indicated by the corresponding arrow, electromagnetic radiation impinges on the detector 8 through the optical reference element 2 ', which in the example shown is a lens that collimates the radiation.
- the alignment of the optical axis of the optical reference element 2 ' can be detected and then corrections can be made with the first adjustable clamping device 4, so that the optical reference element 2' is aligned in the first adjustable clamping device 4 so that its optical axis is aligned the axis of rotation of the spindle 5 matches.
- the second step ii) can be carried out as shown in Figure 2.
- a laser diode is fixed as an emitting element 1 with its housing 1.1 in the second adjustable clamping device 6.
- the electromagnetic radiation emitted by the emitting element 1 emerges from it divergently and is focused with the optical reference element 2 'and strikes an element 10 which deflects this radiation by twice 90 ° through appropriate reflection, so that the electromagnetic radiation impinges on the detector 9, with which the beam cross-sectional geometry of the beam of emitted electromagnetic radiation can be detected.
- the emitting element 1 with its housing 1.1 can be aligned so that its optical axis also coincides with the axis of rotation of the spindle 5.
- the detectors 8 and 9 can be moved translationally parallel to the axis of rotation of the spindle 5, as indicated by the double arrows.
- machining can then be carried out with a turning tool 11 on the surface of the housing 1.1 of the emitting element 1.
- the radially outer wall of the housing 1.1 is machined so that it is aligned parallel to the axis of rotation of the spindle 5 and thus also to the optical axis of the emitting element 1.
- the surface of the housing 1.1 which is arranged around the exit of the electromagnetic radiation emitted by the emitting element 1, is processed so that at least part of this surface has been aligned perpendicular to the axis of rotation of the spindle 5 and to the optical axis of the emitting element 1. If only a part of this surface has been designed in this way, it should protrude over other parts of this surface, so that the vertically aligned surface area in the assembled state in the common socket 7 directly on a corresponding machined surface of a beam-forming optical element 2 or its housing 2.1 is present and the distance between the emitting element 1 and the beam-forming optical element 2 can therefore be maintained exactly if these two elements 1 and 2 have been arranged in the common socket 7, as shown in Figure 6.
- a beam-shaping optical element 2 can also be processed, if necessary with its own housing 2.1.
- the surfaces to be processed on a housing 2.1 of a beam-shaping optical element 2 are shown in Figure 4.
- the outer wall is parallel and the surface pointing in the direction of the emitting element 2 is aligned perpendicular to the optical axis.
- Figure 5 shows this with a laser diode as an emitting element 1 in a housing 1.1.
- the socket 7, into which at least one beam-forming optical element 2 and one emitting element 1 are ultimately fitted, should be manufactured very precisely and its inner diameter should have a very small clearance of approx. 0.001 mm - 0.002 mm corresponding to the outer diameter of the outer wall of the housing 1.1 and 2.1.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Optical Head (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022204699.4A DE102022204699B3 (de) | 2022-05-13 | 2022-05-13 | Verfahren zur Montage, Justierung und Fixierung eines elektromagnetische Strahlung emittierenden Elements in Bezug zu mindestens einem die emittierte elektromagnetische Strahlung strahlformenden optischen Element |
| PCT/EP2023/062839 WO2023218069A1 (de) | 2022-05-13 | 2023-05-12 | Verfahren zur montage, justierung und fixierung eines elektromagnetische strahlung emittierenden elements in bezug zu mindestens einem die emittierte elektromagnetische strahlung strahlformenden optischen element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4523300A1 true EP4523300A1 (de) | 2025-03-19 |
Family
ID=86498176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23727816.3A Pending EP4523300A1 (de) | 2022-05-13 | 2023-05-12 | Verfahren zur montage, justierung und fixierung eines elektromagnetische strahlung emittierenden elements in bezug zu mindestens einem die emittierte elektromagnetische strahlung strahlformenden optischen element |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4523300A1 (de) |
| DE (1) | DE102022204699B3 (de) |
| WO (1) | WO2023218069A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH681493A5 (de) * | 1991-02-20 | 1993-03-31 | Peter Gerber | |
| DE10322587B4 (de) | 2003-05-15 | 2005-08-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren und Vorrichtung zur Herstellung von Referenzflächen an Fassungen optischer Elemente durch eine spanende Bearbeitung sowie damit hergestellte optische Elemente |
| DE102014012354A1 (de) | 2014-08-25 | 2016-02-25 | Innolite Gmbh | Verfahren und Vorrichtung zur ultrapräzisen Bearbeitung einer Referenzfläche eines eine optische Achse aufweisenden Werkstücks |
| WO2019053780A1 (ja) * | 2017-09-12 | 2019-03-21 | 三菱電機株式会社 | 光モジュール及びその製造方法 |
| DE102018106468A1 (de) | 2018-03-20 | 2019-09-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zum Zentrieren eines optischen Elements in einem optischen System für ein Endoskop |
-
2022
- 2022-05-13 DE DE102022204699.4A patent/DE102022204699B3/de active Active
-
2023
- 2023-05-12 WO PCT/EP2023/062839 patent/WO2023218069A1/de not_active Ceased
- 2023-05-12 EP EP23727816.3A patent/EP4523300A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022204699B3 (de) | 2023-06-15 |
| WO2023218069A1 (de) | 2023-11-16 |
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