DE102008056315A1 - Device for homogenization of laser radiation, has substrates with lens arrays, where substrates are partly made from lutetium aluminum garnet, germanium garnet or ceramic spinel - Google Patents
Device for homogenization of laser radiation, has substrates with lens arrays, where substrates are partly made from lutetium aluminum garnet, germanium garnet or ceramic spinel Download PDFInfo
- Publication number
- DE102008056315A1 DE102008056315A1 DE200810056315 DE102008056315A DE102008056315A1 DE 102008056315 A1 DE102008056315 A1 DE 102008056315A1 DE 200810056315 DE200810056315 DE 200810056315 DE 102008056315 A DE102008056315 A DE 102008056315A DE 102008056315 A1 DE102008056315 A1 DE 102008056315A1
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- DE
- Germany
- Prior art keywords
- laser radiation
- substrates
- substrate
- garnet
- lenses
- 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.)
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Links
- 239000000758 substrate Substances 0.000 title claims abstract description 41
- 230000005855 radiation Effects 0.000 title claims abstract description 30
- 239000002223 garnet Substances 0.000 title claims abstract description 16
- 239000000919 ceramic Substances 0.000 title claims abstract description 8
- 229910052732 germanium Inorganic materials 0.000 title claims abstract description 8
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 title claims abstract description 8
- -1 lutetium aluminum Chemical compound 0.000 title claims abstract description 8
- 239000011029 spinel Substances 0.000 title claims abstract description 8
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 8
- 238000003491 array Methods 0.000 title abstract description 4
- 238000000265 homogenisation Methods 0.000 title description 7
- 238000009826 distribution Methods 0.000 claims abstract description 29
- 238000007493 shaping process Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000009102 absorption Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Vorrichtung zur Homogenisierung von Laserstrahlung gemäß dem Oberbegriff des Anspruchs 1 sowie eine Vorrichtung zur Formung von Laserstrahlung gemäß dem Oberbegriff des Anspruchs 6.The The present invention relates to a device for homogenization of laser radiation according to the preamble of claim 1 and an apparatus for shaping laser radiation according to the generic term of claim 6.
Definitionen: In Ausbreitungsrichtung der Laserstrahlung meint mittlere Ausbreitungsrichtung der Laserstrahlung, insbesondere wenn diese keine ebene Welle ist oder zumindest teilweise divergent ist. Mit Laserstrahl, Lichtstrahl, Teilstrahl oder Strahl ist, wenn nicht ausdrücklich anderes angegeben ist, kein idealisierter Strahl der geometrischen Optik gemeint, sondern ein realer Lichtstrahl, wie beispielsweise ein Laserstrahl mit einem Gauß-Profil oder einem modifizierten Gauß-Profil, der keinen infinitesimal kleinen, sondern einen ausgedehnten Strahlquerschnitt aufweist. Mit Top-Hat-Verteilung oder Top-Hat-Intensitätsverteilung oder Top-Hat-Profil ist eine Intensitätsverteilung gemeint, die sich zumindest hinsichtlich einer Richtung im Wesentlichen durch eine Rechteckfunktion (rect (x)) beschreiben lässt. Dabei sollen reale Intensitätsverteilungen, die Abweichungen von einer Rechteckfunktion im Prozentbereich beziehungsweise geneigte Flanken aufweisen, ebenfalls als Top-Hat-Verteilung oder Top-Hat-Profil oder als Top-Hat ähnliche Verteilungen bezeichnet werden. Insbesondere sollen auch sogenannte Multi-Gauß-Verteilungen als Top-Hat ähnliche Verteilungen bezeichnet werden.definitions: In the propagation direction of the laser radiation means mean propagation direction the laser radiation, especially if this is not a plane wave or at least partially divergent. With laser beam, light beam, Partial beam or beam is, unless otherwise specified, no idealized ray of geometric optics meant, but a real light beam, such as a laser beam with a Gaussian profile or a modified Gaussian profile, not an infinitesimal small, but an extended beam cross-section having. With top hat distribution or top hat intensity distribution or top hat profile is meant to be an intensity distribution at least in one direction essentially by one Rectangular function (rect (x)) can be described. Here, real intensity distributions, the deviations from a rectangular function in the percentage range or have inclined flanks, also as a top hat distribution or top hat profile or similar to a top hat Distributions are called. In particular, so-called Multi-Gaussian distributions similar to a top hat Distributions are called.
Eine Vorrichtung zur Homogenisierung von Laserstrahlung der eingangs genannten Art sowie eine Vorrichtung zur Formung von Laserstrahlung der eingangs genannten Art sind bekannt. Wenn derartige Vorrichtungen für Lithographieverfahren verwendet werden, wird in der Regel ein Excimer-Laser mit einer Wellenlänge von 193 nm benutzt. Um für UV-Strahlung dieser Wellenlänge transparent zu sein, sind die Substrate der Vorrichtungen in der Regel aus Quarzglas oder Kalziumfluorid gefertigt.A Device for the homogenization of laser radiation of the beginning mentioned type and a device for shaping laser radiation of The aforementioned type are known. If such devices for lithographic processes usually used is an excimer laser with a wavelength used by 193 nm. Um for UV radiation this wavelength Being transparent, the substrates of the devices are in the Usually made of quartz glass or calcium fluoride.
Als nachteilig bei der Verwendung derartiger Materialien erweist sich, dass Quarzglas oder Kalziumfluorid bei großen Laserleistungen vergleichsweise geringe Standzeiten aufweisen, weil die Substrate aufgrund von Absorptionen und Materialabtrag zerstört werden.When disadvantageous in the use of such materials proves that quartz glass or calcium fluoride comparatively at high laser powers have low lifetimes, because the substrates due to absorptions and material removal destroyed become.
Das der vorliegenden Erfindung zugrunde liegende Problem ist die Schaffung von Vorrichtung der eingangs genannten Arten, die bei hohen Laserleistungen robuster sind.The The problem underlying the present invention is the creation of device of the aforementioned types, which at high laser powers are more robust.
Dies wird erfindungsgemäß hinsichtlich der Vorrichtung zur Homogenisierung von Laserstrahlung durch eine Vorrichtung der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 sowie hinsichtlich der Vorrichtung zur Formung von Laserstrahlung durch eine Vorrichtung der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 6 gelöst. Die Unteransprüche betreffen bevorzugte Ausgestaltungen der Erfindung.This is according to the invention in terms the device for homogenizing laser radiation by a Device of the type mentioned above with the characterizing features of claim 1 and with regard to the device for forming Laser radiation by a device of the type mentioned solved with the characterizing features of claim 6. The under claims relate to preferred embodiments of the invention.
Gemäß Anspruch 1 und Anspruch 6 ist vorgesehen, dass das mindestens eine Substrat zumindest teilweise aus Lutetium-Aluminium-Granat oder aus einem Germanium-Granat oder aus einem keramischen Spinell besteht. Derartige Materialien sind einerseits stabiler und neigen nicht so stark zur Zerstörung bei Absorption großer Laserleistungen wie beispielsweise Kalziumfluorid. Andererseits weisen diese Materialien einen größeren Brechungsindex auf als Quarzglas oder Kalziumfluorid, so dass flachere Strukturen die gleichen Wirkungen erzielen können. Dies führt dazu, dass das mindestens eine Substrat dünner und weniger stark gekrümmt sein kann, als die aus Quarzglas oder Kalziumfluorid bestehenden Substrate. Dies führt wiederum zu einer geringeren absoluten Absorption und damit zu einem geringeren Materialabtrag.According to claim 1 and claim 6 it is provided that the at least one substrate at least partially made of lutetium-aluminum garnet or a germanium garnet or a ceramic spinel consists. On the one hand, such materials are more stable and tend not so much for destruction when absorbing large Laser powers such as calcium fluoride. on the other hand these materials have a higher refractive index than Quartz glass or calcium fluoride, so that flatter structures the same Can achieve effects. this leads to in that the at least one substrate may be thinner and less curved, as the substrates made of quartz glass or calcium fluoride. this leads to again to a lower absolute absorption and thus to a lower one Material removal.
Damit eignen sich diese Materialien sehr gut für Vorrichtungen zur Homogenisierung und zur Formung von Laserlicht in Beleuchtungssystemen von Steppern für die Lithographie. Der Lithographieprozess kann durch die erfindungsgemäßen Vorrichtungen mit größeren Laserleistungen erfolgen, so dass er insgesamt schneller werden kann.In order to These materials are very well suited for homogenization devices and for shaping laser light in illumination systems of steppers for the Lithograph. The lithographic process can be performed by the devices according to the invention with larger laser powers done so that it can be faster overall.
Weitere Merkmale und Vorteile der vorliegenden Erfindung werden deutlich anhand der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die beiliegenden Abbildungen. Darin zeigenFurther Features and advantages of the present invention will become apparent with reference to the following description of preferred embodiments with reference to the attached figures. Show in it
In
den Figuren sind zur besseren Orientierung kartesische Koordinatensysteme
eingezeichnet. Von links in den Figuren, beziehungsweise in positiver
Z-Richtung kann Laserstrahlung
Die
aus
Jedes
der Substrate
Auf
einem jeden der Substrate
Das
zweite Linsenarray
Das
erste Substrat
Die
Linsen
Es besteht alternativ durchaus die Möglichkeit sphärische Linsen anstelle der Zylinderlinsen vorzusehen.It Alternatively, there is the possibility of spherical lenses provide in place of the cylindrical lenses.
Die
Linsen
Die
Substrate
Die
Strukturen, die zur Ausbildung der Linsen
Weiterhin
umfasst die in
Das
die Powelllinse bildende Substrat
Die Strukturen, die zur Ausbildung der Powelllinse führen, können eine Tiefe zwischen 0,1 μm und 5000,0 μm, insbesondere zwischen 50,0 μm und 1000,0 μm aufweisen.The Structures that lead to the formation of the Powell lens, a depth between 0.1 microns and 5000.0 microns, in particular between 50.0 μm and 1000.0 μm exhibit.
Auf
die zweite Ausführungsform
einer Vorrichtung zur Formung von Laserstrahlung (siehe
Die
erste refraktive Fläche
Die
zweite refraktive Fläche
Die
Substrate
Es
besteht die Möglichkeit,
dass die beiden refraktiven Flächen
Die
Substrate
Die
Strukturen, die zur Ausbildung der refraktiven Flächen
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810056315 DE102008056315A1 (en) | 2008-11-07 | 2008-11-07 | Device for homogenization of laser radiation, has substrates with lens arrays, where substrates are partly made from lutetium aluminum garnet, germanium garnet or ceramic spinel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810056315 DE102008056315A1 (en) | 2008-11-07 | 2008-11-07 | Device for homogenization of laser radiation, has substrates with lens arrays, where substrates are partly made from lutetium aluminum garnet, germanium garnet or ceramic spinel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102008056315A1 true DE102008056315A1 (en) | 2010-05-12 |
Family
ID=42096401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE200810056315 Withdrawn DE102008056315A1 (en) | 2008-11-07 | 2008-11-07 | Device for homogenization of laser radiation, has substrates with lens arrays, where substrates are partly made from lutetium aluminum garnet, germanium garnet or ceramic spinel |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102008056315A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009005844B4 (en) * | 2009-01-21 | 2018-11-22 | Jenoptik Optical Systems Gmbh | Arrangement for converting gaussian laser radiation |
| JPWO2019012642A1 (en) * | 2017-07-13 | 2020-05-07 | ギガフォトン株式会社 | Laser system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846638A (en) * | 1988-08-30 | 1998-12-08 | Onyx Optics, Inc. | Composite optical and electro-optical devices |
| US6008943A (en) * | 1997-11-26 | 1999-12-28 | Metelitsa; Gregory | Laser optical system for micromachining |
| EP1701179A1 (en) * | 2005-03-08 | 2006-09-13 | Schott AG | Method for producing optical elements for microlithography, lens systems obtainable therewith and their use |
| US20070109519A1 (en) * | 2005-11-17 | 2007-05-17 | Joerg Ferber | Method and apparatus for providing uniform illumination of a mask in laser projection systems |
| DE102007026730A1 (en) * | 2006-06-10 | 2007-12-20 | Hentze-Lissotschenko Patentverwaltungs Gmbh & Co. Kg | Laser irradiation`s homogeneous angular distribution generating apparatus, has homogenization stage with two substrates and lens array, where distance between two substrates of stage influences angular distribution |
| WO2008078952A1 (en) * | 2006-12-26 | 2008-07-03 | Qmc Co., Ltd. | System and method for deliverying laser beam and laser lift-off method using the same |
| US20080164402A1 (en) * | 2007-01-09 | 2008-07-10 | Yvonne Menke | Moulding tool for moulding a ceramic green body and use of said moulding tool |
-
2008
- 2008-11-07 DE DE200810056315 patent/DE102008056315A1/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5846638A (en) * | 1988-08-30 | 1998-12-08 | Onyx Optics, Inc. | Composite optical and electro-optical devices |
| US6008943A (en) * | 1997-11-26 | 1999-12-28 | Metelitsa; Gregory | Laser optical system for micromachining |
| EP1701179A1 (en) * | 2005-03-08 | 2006-09-13 | Schott AG | Method for producing optical elements for microlithography, lens systems obtainable therewith and their use |
| US20070109519A1 (en) * | 2005-11-17 | 2007-05-17 | Joerg Ferber | Method and apparatus for providing uniform illumination of a mask in laser projection systems |
| DE102007026730A1 (en) * | 2006-06-10 | 2007-12-20 | Hentze-Lissotschenko Patentverwaltungs Gmbh & Co. Kg | Laser irradiation`s homogeneous angular distribution generating apparatus, has homogenization stage with two substrates and lens array, where distance between two substrates of stage influences angular distribution |
| WO2008078952A1 (en) * | 2006-12-26 | 2008-07-03 | Qmc Co., Ltd. | System and method for deliverying laser beam and laser lift-off method using the same |
| US20080164402A1 (en) * | 2007-01-09 | 2008-07-10 | Yvonne Menke | Moulding tool for moulding a ceramic green body and use of said moulding tool |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009005844B4 (en) * | 2009-01-21 | 2018-11-22 | Jenoptik Optical Systems Gmbh | Arrangement for converting gaussian laser radiation |
| JPWO2019012642A1 (en) * | 2017-07-13 | 2020-05-07 | ギガフォトン株式会社 | Laser system |
| US11217962B2 (en) | 2017-07-13 | 2022-01-04 | Gigaphoton Inc. | Laser system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20110601 Effective date: 20110531 |