DE19845786A1 - Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions - Google Patents

Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions

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Publication number
DE19845786A1
DE19845786A1 DE1998145786 DE19845786A DE19845786A1 DE 19845786 A1 DE19845786 A1 DE 19845786A1 DE 1998145786 DE1998145786 DE 1998145786 DE 19845786 A DE19845786 A DE 19845786A DE 19845786 A1 DE19845786 A1 DE 19845786A1
Authority
DE
Germany
Prior art keywords
focusing ability
laser diode
improve focusing
radiation
spatial directions
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Withdrawn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
DE1998145786
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German (de)
Inventor
Bernd Ozygus
Juergen Erhard
Friedemann Scholz
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.)
Individual
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Individual
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 Individual filed Critical Individual
Priority to DE1998145786 priority Critical patent/DE19845786A1/en
Priority to DE1999101500 priority patent/DE19901500A1/en
Publication of DE19845786A1 publication Critical patent/DE19845786A1/en
Withdrawn legal-status Critical Current

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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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The arrangement has several plates (2), which may be plane parallel or have curved surfaces, to displace parts of the laser radiation so as to cause improved focusing ability of the radiation in one of the two spatial directions. Both the fast-axis and the slow-axis of the laser beam are collimated.

Description

Mit den heutigen Hochleistungslaserdiodenbarren und den zu sogenannten "Stacks" zusammengefaßten Barren lassen sich optische Leistungen von mehreren 1000 Watt erzeugen. Der direkten Anwendung dieser Leistung steht in vielen Fällen aber die schlechte Fokussierbarkeit der Strahlung in einer Raumrichtung im Wege. Lösungen dieses Problems sind mit hohem technologischen Aufwand verbunden. Ein Beispiel dafür sind die sogenannten "Treppenspiegel", bei denen die Strahlung jedes einzelnen Emitters getrennt verändert wird (Abb. 1, siehe auch "Advanced Concepts of using diode lasers in materials processing", P. Loosen, Lasers in Material Processing, Laser '97 3097 (480485) SPIE (1997)). Diese Abhängigkeit von der Verteilung (Breite, Abstand) der Emitter auf dem Barren ist ein Kennzeichen der zur Zeit benutzten Anordnungen.With today's high-power laser diode bars and the bars combined into so-called "stacks", optical powers of several 1000 watts can be generated. In many cases, however, the direct application of this power is impeded by the poor focusability of the radiation in one spatial direction. Solutions to this problem are associated with a high level of technological effort. An example of this are the so-called "stair mirrors", in which the radiation of each individual emitter is changed separately ( Fig. 1, see also "Advanced Concepts of using diode lasers in materials processing", P. Loosen, Lasers in Material Processing, Laser ' 97 3097 (480485) SPIE (1997)). This dependence on the distribution (width, distance) of the emitters on the ingot is characteristic of the arrangements currently used.

Es besteht die Notwendigkeit, eine einfache effektive Optik zur Verbesserung der Fokussierbarkeit von Laserdioden, Laserdiodenbarren und von Stacks aus Laserdiodenbarren zu finden. Die in dieser Erfindung beschriebene Optik verbessert die Fokussierbarkeit, indem mithilfe planparalleler Platten, die schräg in den Strahlengang gestellt werden, Teilbereiche des Strahl so verschoben werden, daß es zu einer Verbesserung der Fokussierbarkeit in einer Raumrichtung kommt. Notwendig für die Anwendung der Erfindung ist eine Kollimierung der sogenannten "fast axis" der Laserdiode oder des Laserdiodenbarrens. Besonders vorteilhaft ist die Optik, wenn bei den Laserdiodenbarren außerdem auch eine Kollimierung der "slow axis" erfolgt ist.There is a need for simple effective optics for improvement the focusability of laser diodes, laser diode bars and stacks Finding laser diode bars. The optics described in this invention are improved the focusability by using plane-parallel plates that slant in the Beam path are made, parts of the beam are shifted so that it there is an improvement in focusability in one spatial direction. A collimation of the so-called is necessary for the application of the invention "Fast axis" of the laser diode or the laser diode bar. The is particularly advantageous Optics, if a collimation of the "slow axis "is done.

Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegenden Zeichnungen im einzelnen erläutert. Es zeigt Abb. 2 die typische, extrem astigmatische Intensitätsverteilung (1) (senkrecht zur Ausbreitungsrichtung) eines in der vertikalen Richtung (fast axis) kollimierten Strahls einer Laserdiode oder eines Laserdiodenbarrens. Ziel der Optik ist die Umstrukturierung der Verteilung in eine weniger astigmatische Form. Der Strahl passiert einen Stapel aus schräg in den Strahlengang gestellten planparallelen Platten (2). In dem Ausführungsbeispiel ist ein Stapel aus fünf Platten dargestellt. Die Pfeile symbolisieren den Weg, um den die jeweilige Platte den Teilstrahl verschiebt. Die Abb. 3 zeigt die Funktionsweise der Platten in der Draufsicht. Es sind zwei Platten (3) und (4) mit unterschiedlichen Winkeln dargestellt. Hinter der Optik hat der Strahl die in Abb. 4 dargestellte Form. Der Astigmatismus des Strahl ist deutlich verringert. Durch eine geeignete Wahl der Zahl der Platten, der Winkel der einzelnen Platten, der Plattendicke sowie des Drehwinkels des gesamten Stapels lassen sich je nach Wunsch mehr quadratische, elliptische oder runde Formen erzeugen.The invention is explained in detail below with reference to a preferred embodiment with reference to the attached drawings. Fig. 2 shows the typical, extremely astigmatic intensity distribution ( 1 ) (perpendicular to the direction of propagation) of a beam of a laser diode or a laser diode bar collimated in the vertical direction (fast axis). The aim of the optics is to restructure the distribution into a less astigmatic form. The beam passes through a stack of plane-parallel plates ( 2 ) placed at an angle in the beam path. In the exemplary embodiment, a stack of five plates is shown. The arrows symbolize the path by which the respective plate shifts the partial beam. Fig. 3 shows the functionality of the plates in a top view. Two plates ( 3 ) and ( 4 ) are shown with different angles. The beam behind the optics has the shape shown in Fig. 4. The astigmatism of the beam is significantly reduced. Through a suitable choice of the number of plates, the angle of the individual plates, the plate thickness and the angle of rotation of the entire stack, more square, elliptical or round shapes can be created as desired.

Anwendungen dieser Optik sind - insbesondere auch bei Stacks - die Direktanwendung der Laserdiodenstrahlung zur Materialbearbeitung, das Pumpen von Festkörperlasern und die Einkopplung der Strahlung in Lichtwellenleiter.Applications of this optic are - especially for stacks Direct application of laser diode radiation for material processing, pumping of solid-state lasers and the coupling of the radiation into optical fibers.

Claims (2)

1. Eine Strahlformungsoptik zur Formung der Strahlung aus Laserdioden, Laserdiodenarrays oder Laserdiodenstreifen, dadurch gekennzeichnet, daß Teile der Strahlung mithilfe von mehreren Platten, die sowohl planparallel als auch mit gekrümmten Flächen versehen sein können, so verschoben werden, daß es insgesamt in einer der beiden Raumrichtungen zu einer Verbesserung der Fokussierbarkeit der Strahlung kommt.1. A beam shaping optics for shaping the radiation from laser diodes, laser diode arrays or laser diode strips, characterized in that parts of the radiation are shifted with the aid of several plates, which can be both plane-parallel and with curved surfaces, so that it is in one of the two Spatial directions to improve the focusability of the radiation. 2. Eine Strahlformungsoptik zur Formung der Strahlung aus Laserdioden, Laserdiodenarrays oder Laserdiodenstreifen nach Anspruch 1, dadurch gekennzeichnet, daß neben der fast-axis auch die slow-axis der Strahlung kollimiert wurde.2. A beam shaping optics for shaping the radiation from laser diodes, Laser diode arrays or laser diode strips according to claim 1, characterized characterized that in addition to the fast axis, the slow axis of the radiation was collimated.
DE1998145786 1998-09-21 1998-09-21 Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions Withdrawn DE19845786A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1998145786 DE19845786A1 (en) 1998-09-21 1998-09-21 Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions
DE1999101500 DE19901500A1 (en) 1998-09-21 1999-01-11 Optical arrangement for improving focussability of radiation from laser diodes has optically surface structured element consisting of mutually inclined surfaces on input and output sides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998145786 DE19845786A1 (en) 1998-09-21 1998-09-21 Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions

Publications (1)

Publication Number Publication Date
DE19845786A1 true DE19845786A1 (en) 2000-05-25

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DE1998145786 Withdrawn DE19845786A1 (en) 1998-09-21 1998-09-21 Optical arrangement to improve focusing ability of laser diode beams; has several plates that displace parts of laser beam to improve focusing ability in one of two spatial directions

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DE (1) DE19845786A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6661568B2 (en) * 2000-08-29 2003-12-09 Jenoptik Laser, Optik Systeme Gmbh Diode-pumped laser amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6661568B2 (en) * 2000-08-29 2003-12-09 Jenoptik Laser, Optik Systeme Gmbh Diode-pumped laser amplifier

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