EP1638779A1 - Dispositif de concentration servant a concentrer la lumiere d'une unite laser a semi-conducteurs comprenant une pluralite d'emetteurs dans un plan de travail et dispositif d'eclairage pourvu d'un tel dispositif de concentration - Google Patents

Dispositif de concentration servant a concentrer la lumiere d'une unite laser a semi-conducteurs comprenant une pluralite d'emetteurs dans un plan de travail et dispositif d'eclairage pourvu d'un tel dispositif de concentration

Info

Publication number
EP1638779A1
EP1638779A1 EP04739474A EP04739474A EP1638779A1 EP 1638779 A1 EP1638779 A1 EP 1638779A1 EP 04739474 A EP04739474 A EP 04739474A EP 04739474 A EP04739474 A EP 04739474A EP 1638779 A1 EP1638779 A1 EP 1638779A1
Authority
EP
European Patent Office
Prior art keywords
light
imaging device
semiconductor laser
laser unit
emitters
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.)
Withdrawn
Application number
EP04739474A
Other languages
German (de)
English (en)
Inventor
Vitalij Lissotschenko
Fedor Karpushko
Mikhail Petrov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hentze Lissotschenko Patentverwaltungs GmbH and Co KG
Original Assignee
Hentze Lissotschenko Patentverwaltungs GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hentze Lissotschenko Patentverwaltungs GmbH and Co KG filed Critical Hentze Lissotschenko Patentverwaltungs GmbH and Co KG
Publication of EP1638779A1 publication Critical patent/EP1638779A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
    • G02B19/0057—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode in the form of a laser diode array, e.g. laser diode bar
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • 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
    • G02B27/0966—Cylindrical lenses
    • 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
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping

Definitions

  • Imaging device for imaging the light of a semiconductor laser unit with a plurality of emitters in a working plane and lighting device with such an imaging device
  • the present invention relates to an imaging device for imaging the light of a semiconductor laser unit with a plurality of emitters in a working plane, comprising a collimation means for the at least partial collimation of the light coming from the semiconductor laser unit in at least one
  • the present invention relates to an illumination device for illuminating a predeterminable region of a working plane, comprising a semiconductor laser unit and an imaging device of the aforementioned type.
  • a laser diode bar is used as the semiconductor laser unit, which has a multiplicity of emitters which are arranged next to one another at a distance from one another in a first direction.
  • Direction is the so-called slow axis, within which the divergence of the light emerging from the laser diode bar is smaller than in a direction perpendicular thereto, referred to as the fast axis.
  • the imaging device sees a fast
  • Axis collimation lens for collimating the divergence in the fast axis direction.
  • the cylinder axes extend in the fast axis.
  • Each of these cylindrical lenses is assigned to one of the emitters of the laser diode bar and is used for collimation or for focusing the slow-axis component of the light. With these two cylindrical lens arrays, the slow
  • Axis creates a near-field image of the emitters, in which the light of the individual emitters is not overlapping.
  • This near-field image is imaged in a working plane by further collimation or focusing lenses or field lenses.
  • This working level can be, for example, the modulation level of a modulator for a
  • Laser diode bars are correlated with one another, so that very often each of the emitters has an intensity distribution of the emitted light that is not even, particularly in the direction of the slow axis.
  • An example of such correlated emitters can be seen in FIG. 5a, in which the intensity distribution 14 of two is exemplary
  • a comb-shaped waveguide means which has a plurality of waveguides, is inserted between the fast-axis collimation lens and the lens array used for slow-axis collimation or instead of the fast-axis collimation lens.
  • Each of these waveguides is assigned to one of the emitters. I in each one
  • the lighting device is expensive to manufacture and, on the other hand, it is less effective because the large number of optical components results in greater losses.
  • the imaging device comprises light guide means which have an entry surface for light emerging from the collimating means and an exit surface from which light can exit to the focusing means, the imaging device being designed such that light from at least two enters the entry surface the emitter can enter.
  • the light guide means are preferably designed in such a way that the light from the at least two emitters can be at least partially mixed within the light guide means.
  • the light of the at least two emitters is mixed within the light guide means only in a direction perpendicular to the direction of propagation. This can be, for example, the slow axis direction.
  • the imaging device is preferably designed such that light from essentially all of the emitters of the
  • Semiconductor laser unit can enter the entry surface of the light guide. According to the invention it can be achieved that not only is the light from an individual emitter superimposed on itself and possibly homogenized in the light guide means, but that the light from two or more, in particular all, emitters is superimposed or mixed. On the one hand, this results in a significantly more effective overlay than in the prior art known from the aforementioned international patent application. On the other hand, significantly fewer parts can be used because, in particular when all emitters are superimposed, the lens arrays which associate each of the emitters with a single cylindrical lens can be omitted. I n particular the lens arrays contribute significantly to the manufacturing costs of an imaging device of the type mentioned.
  • the light guide means are designed as an at least partially transparent plane-parallel plate which extends essentially in the direction of propagation of the light.
  • the extent of the entry surface can be smaller in a first direction than in a second direction perpendicular to it.
  • the extent of the entry surface in the slow axis direction can be significantly smaller than in the fast axis direction. Due to a very small expansion of the light guide in the slow axis direction, the number of reflections with regard to the slow axis portion of the light is significantly increased, so that a significantly greater mixing of the slow
  • Axis share takes place. Under certain circumstances, if the light of all emitters is to enter the entry surface, a focusing lens with regard to the slow axis component must be provided in front of the entry surface in order to couple the light of all emitters into the entry surface, which is comparatively narrow in the slow axis direction.
  • the light guide means are designed as an at least partially transparent body which extends essentially in the direction of propagation of the light and which has a smaller extent in the direction of propagation in the middle in a direction perpendicular to the direction of propagation than on its side facing the semiconductor laser unit.
  • the body can be comparatively wide in the slow axis direction
  • the body of the light-guiding means preferably has a larger extension in its direction perpendicular to the direction of propagation on its outlet side facing away from the semiconductor laser unit than in its center. This widening of the body adjoining the narrow center ensures that the light emerging from the exit surface is already partially collimated and does not have to be passed through additional collimation lenses before it can be imaged by the focusing means in the working plane. In this way, additional components are saved, so that the imaging device manages with a minimal number of optical elements. The losses within the imaging device can thereby be minimized. Furthermore, the manufacturing costs can be reduced.
  • the fast-axis portion of the light can pass through the light-guiding means largely unhindered, so that the collimation of the fast-axis portion is essentially not influenced.
  • the entry surface and / or the side surfaces and / or the exit surface of the light guide means are structured.
  • This structuring of the entry surface and / or the side surfaces and / or the exit surface can preferably be realized by roughening, in particular by targeted roughening.
  • Such a structuring can di ⁇ mixing can be improved because, in particular, a comparatively arbitrary or chaotic reflection or transmission takes place on the corresponding surfaces.
  • the collimation means can be used as in the prior art.
  • the focusing means can comprise a first focusing lens and a second focusing lens, which can serve in particular as a field lens.
  • the lighting device according to the invention is characterized by an imaging device according to the invention.
  • the semiconductor laser unit and the imaging device are arranged on a common carrier.
  • the semiconductor laser unit and imaging device can be permanently preassembled at the factory.
  • the lighting device according to the invention can comprise a semiconductor laser unit with a laser diode bar.
  • FIG. 1 shows a perspective view of an illumination device according to the invention with an imaging device according to the invention
  • Fig. 2 is a view according to the arrow I l in Fig. 1;
  • Fig. 3 is a view according to the arrow I I I in Fig. 1;
  • Fig. 4 is a perspective view of another embodiment of an inventive
  • Illumination device with a further embodiment of an imaging device according to the invention.
  • 5a schematically shows the intensity distribution of individual emitters of a laser diode bar
  • FIG. 5b schematically shows the superposition of the intensity distributions according to FIG. 5a;
  • 5c schematically shows the overall intensity distribution that can be achieved with an illumination device according to the invention.
  • an illumination device comprises a semiconductor laser unit 1 and an imaging device 2, which are arranged on a common carrier 3.
  • the semiconductor laser unit 1 comprises a laser diode bar 4 and corresponding heat sinks 5.
  • a laser diode bar generally has emitters arranged next to one another in one direction, in the illustrated direction in the X direction. Furthermore, a laser diode bar has a smaller divergence in the X direction in which the emitters are arranged next to one another than in the Y direction perpendicular to it. For this reason, the Y direction is called the fast axis and the X direction is called the slow axis.
  • the light in FIG. 1 essentially emanates from the laser diode bar 4 in the positive Z direction.
  • the collimation means 6 which is designed as a fast-axis collimation lens.
  • the fast-axis collimation lens is essentially a cylindrical lens with a cylindrical axis in the X direction.
  • the collimation means 6 collimates the laser radiation emerging from the laser diode bar 4 in the Y direction.
  • the fast-axis collimation lens is followed in the positive Z direction by a further cylindrical lens 7, the cylinder axis of which extends in the Y direction.
  • the cylindrical lens 7 is used to focus the light emerging from the collimation means 6 onto the entry surface of a light guide 8 arranged behind the cylinder lens 7 in the positive Z direction.
  • the light guide 8 is comparatively thin in the embodiment shown in FIGS. 1 to 3 , plane-parallel plate made of an at least partially transparent material, which extends essentially in the Z direction.
  • the dimension of the light guide is 8 in X direction significantly smaller than in the Y direction and in the Z direction.
  • the cylindrical lens 7 and the light-guiding means 8 are in particular arranged in such a way that light from several emitters of the laser diode bar 4, in particular the light from all emitters of the laser diode bar 4, enters the entrance surface, that is to say the side of the light-guiding means 8 facing the cylindrical lens 7 in FIG. 1 ,
  • the light from the emitters of the laser diode bar 4 is forwarded in the Z direction within the light guide means, in particular the exit from the side surfaces due to total rejection is largely prevented, so that this in the
  • Light-guiding means 8 light that has left it leaves in the positive Z direction at the right-hand end in FIG. 1.
  • a further cylindrical lens 9 is arranged behind the light guide 8 in the positive Z direction and at least partially collimates the light emerging from the light guide 8 in the X direction.
  • the cylinder axis of the cylindrical lens 9 extends in the Y direction.
  • the imaging device 2 comprises two focusing lenses 10, 11, which can focus or image the light into a working plane (not shown).
  • the first focusing lens 10 is designed as a cylindrical lens with a cylindrical axis in the Y direction.
  • the second focusing lens 1 1 is designed as a spherical lens. It is entirely possible to design the focusing lenses 10, 11 differently, for example to combine them in a single lens. Furthermore, a cylindrical lens with a cylindrical axis in the X direction can be used instead of the spherical focusing lens 11.
  • the focusing lenses 10, 1 1, together with the cylindrical lens 9 used for collimation have the task of imaging the light emerging from the light guide 8 into a certain predetermined area of the working plane. It is achieved by the light guide 8 that the light emanating from several emitters of the laser diode bar 4 is randomly superimposed within the light guide in such a way that the light of the different ones is superimposed in the working plane
  • the Emitter of the laser diode bar 4 is formed, which has a very uniform intensity distribution over the illuminated area.
  • the light-guiding means 8 is designed such that the fast-axis portion of the light emanating from the laser diode bar 4 is not influenced by the light-guiding means, so that a mixture, in particular an arbitrary or chaotic mixture of the light, only in the slow-axis direction takes place.
  • the imaging device 2 according to the invention In contrast to the prior art, in which the light emanating from individual emitters was superimposed in such a way that, for example, all the emitters on the left side (see intensity distribution 14 of the individual emitters in FIG a very disadvantageous increase in total intensity (see total intensity distribution 15 in FIG. 5b) on the left-hand side, in the imaging device 2 according to the invention the light emanating from different emitters of the laser diode bar 4 is so randomly and chaotically superimposed that even if, for example, all emitters on it have an intensity increase on the left side, the superimposition of the light taking place in the working plane has no intensity increase on the left side (see total intensity distribution 16 after passing through the imaging device 2 according to the invention in FIG ig.5c).
  • This arbitrary and chaotic overlay effect can be reinforced in particular by the fact that the entrance area and / or the side surfaces of the light guide 8 are roughened in a targeted manner.
  • a sine structure can be applied that has axes of symmetry in the Y direction, so that only the slow-axis component of the light passing through the light guide 8 is influenced, but not the fast-axis component.
  • the semiconductor laser unit 1 does not differ from the semiconductor laser unit of the embodiment according to FIGS. 1 to 3.
  • the imaging device 12 likewise does not have a second cylindrical lens arranged behind the light guide 13 and used to collimate the slow axis. Rather, in the positive Z direction, the focusing lenses 10 adjoin the exit surface of the light guide 13,
  • the cylindrical lenses 7, 9 in front of and behind the light guide 13 can be omitted.
  • the entry surface of the light guide 13 in the X direction is so wide that the light of several, in particular all, emitters of the laser diode bar 4 enters the entry surface.
  • the constriction of the width in the X direction of the light guide 13 approximately in the central region makes it effective
  • the light-guiding means 13 can be structured similarly to the light-guiding means 8 on the entry surface and / or on the side surfaces and / or the exit surface in order to support the mixing of the light with regard to the slow-axis component.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Semiconductor Lasers (AREA)

Abstract

L'invention concerne un dispositif de concentration servant à concentrer la lumière d'une unité laser à semi-conducteurs (1) comprenant une pluralité d'émetteurs dans un plan de travail. Ce dispositif de concentration comprend des moyens de collimation (6) servant à collimater au moins partiellement la lumière provenant de l'unité laser à semi-conducteurs (1) dans au moins une direction (Y) sensiblement perpendiculaire à la direction de diffusion (Z) de la lumière, ainsi que des moyens de focalisation servant à focaliser ou concentrer au moins partiellement la lumière au moins partiellement collimatée dans le plan de travail. Selon l'invention, le dispositif de concentration (2, 12) comprend par ailleurs des moyens de guidage de lumière (8, 13) présentant une surface d'entrée pour la lumière provenant des moyens de collimation (6), ainsi qu'une surface de sortie à partir de laquelle la lumière peut sortir en direction des moyens de focalisation, le dispositif de concentration (2, 12) étant conçu de telle sorte que la lumière d'au moins deux émetteurs puisse entrer dans la surface d'entrée. L'invention concerne en outre un dispositif d'éclairage pourvu d'un tel dispositif de concentration.
EP04739474A 2003-06-18 2004-05-29 Dispositif de concentration servant a concentrer la lumiere d'une unite laser a semi-conducteurs comprenant une pluralite d'emetteurs dans un plan de travail et dispositif d'eclairage pourvu d'un tel dispositif de concentration Withdrawn EP1638779A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10327735A DE10327735A1 (de) 2003-06-18 2003-06-18 Abbildungsvorrichtung für die Abbildung des Lichtes einer Halbleiterlasereinheit mit einer Mehrzahl von Emittern in einer Arbeitsebene sowie Beleuchtungsvorrichtung mit einer derartigen Abbildungsvorrichtung
PCT/EP2004/005863 WO2004110769A1 (fr) 2003-06-18 2004-05-29 Dispositif de concentration servant a concentrer la lumiere d'une unite laser a semi-conducteurs comprenant une pluralite d'emetteurs dans un plan de travail et dispositif d'eclairage pourvu d'un tel dispositif de concentration

Publications (1)

Publication Number Publication Date
EP1638779A1 true EP1638779A1 (fr) 2006-03-29

Family

ID=33495181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04739474A Withdrawn EP1638779A1 (fr) 2003-06-18 2004-05-29 Dispositif de concentration servant a concentrer la lumiere d'une unite laser a semi-conducteurs comprenant une pluralite d'emetteurs dans un plan de travail et dispositif d'eclairage pourvu d'un tel dispositif de concentration

Country Status (5)

Country Link
EP (1) EP1638779A1 (fr)
JP (1) JP2006527857A (fr)
KR (1) KR20060016816A (fr)
DE (1) DE10327735A1 (fr)
WO (1) WO2004110769A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7355800B2 (en) * 2005-02-07 2008-04-08 Coherent, Inc. Apparatus for projecting a line of light from a diode-laser array
DE102012012992A1 (de) 2012-06-29 2014-01-02 Limo Patentverwaltung Gmbh & Co. Kg Laservorrichtung sowie Vorrichtung und Verfahren zur Formung von Laserstrahlung

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JP2733055B2 (ja) * 1986-08-13 1998-03-30 富士写真フイルム 株式会社 サイドプリント用ヘツド装置
US5745153A (en) * 1992-12-07 1998-04-28 Eastman Kodak Company Optical means for using diode laser arrays in laser multibeam printers and recorders
US5923475A (en) * 1996-11-27 1999-07-13 Eastman Kodak Company Laser printer using a fly's eye integrator
EP1166165B1 (fr) * 1999-03-31 2002-09-11 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Dispositif optique pour rendre symetriques les rayonnements de reseaux bidimensionnels de diodes laser
DE19918444C2 (de) * 2000-03-15 2001-06-21 Laserline Ges Fuer Entwicklung Laseroptik sowie Diodenlaser
DE19948889C1 (de) * 1999-10-11 2001-06-07 Unique M O D E Ag Vorrichtung zur Symmetrierung der Strahlung von linearen optischen Emittern und Verwendung der Vorrichtung
US6433934B1 (en) 2000-08-11 2002-08-13 Yakov Reznichenko Illumination system for use in imaging systems
DE10293000D2 (de) 2001-07-05 2004-04-15 Hentze Lissotschenko Patentver Element zur Fokussierung der Strahlung eines Laserdiodenbarrens
DE10136611C1 (de) * 2001-07-23 2002-11-21 Jenoptik Laserdiode Gmbh Optische Anordnung zur Formung und Homogenisierung eines von einer Laserdiodenanordnung ausgehenden Laserstrahls

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Title
See references of WO2004110769A1 *

Also Published As

Publication number Publication date
DE10327735A1 (de) 2005-01-05
WO2004110769A1 (fr) 2004-12-23
KR20060016816A (ko) 2006-02-22
JP2006527857A (ja) 2006-12-07

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