WO1997008789A2 - Laser system - Google Patents

Laser system Download PDF

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Publication number
WO1997008789A2
WO1997008789A2 PCT/DE1996/001500 DE9601500W WO9708789A2 WO 1997008789 A2 WO1997008789 A2 WO 1997008789A2 DE 9601500 W DE9601500 W DE 9601500W WO 9708789 A2 WO9708789 A2 WO 9708789A2
Authority
WO
WIPO (PCT)
Prior art keywords
laser
active medium
reflection
coating
reducing
Prior art date
Application number
PCT/DE1996/001500
Other languages
German (de)
French (fr)
Other versions
WO1997008789A3 (en
Inventor
Johann Luft
Original Assignee
Siemens Aktiengesellschaft
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
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Publication of WO1997008789A2 publication Critical patent/WO1997008789A2/en
Publication of WO1997008789A3 publication Critical patent/WO1997008789A3/en

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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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0602—Crystal lasers or glass lasers
    • H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • 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
    • H01S2301/00—Functional characteristics
    • H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0619—Coatings, e.g. AR, HR, passivation layer
    • H01S3/0625—Coatings on surfaces other than the end-faces
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094084—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light with pump light recycling, i.e. with reinjection of the unused pump light, e.g. by reflectors or circulators

Definitions

  • the invention relates to a laser system with a laser-active medium provided within a laser resonator, in which the outer boundary surfaces of the laser-active medium at least partially have a highly or partially reflecting mirror arrangement.
  • the lateral boundaries of the laser-active medium in the case of gas lasers consist of the lateral boundaries of the laser chamber, and in the case of solid-state lasers, the lateral boundaries of the laser chamber.
  • Can lead 20 desired laser radiation. This disturbing effect is particularly great when total reflection takes place at the edges of the outer surfaces delimiting the resonator and the laser-active medium is highly amplifying. In the laser systems that have become known so far, the suggestion of
  • ⁇ Body laser or amplifier has become known in which the laser crystal consists of a material that does not absorb the pump light and an absorbent material with the same refractive index and
  • the layers consist of doped and undoped material of the same host lattice crystal or host lattice glass. This measure not only increases the efficiency, but also improves the beam quality with reduced cooling requirements of the laser system.
  • a solid-state laser has become known from JP-PATENT ABSTRACTS 07111350 A, in which the core area of the rod-shaped neodymium-doped YAG laser crystal is surrounded by a cladding material made of undoped YAG crystal, which is matched to the core material by refractive index and essentially does not absorb the Excitation light and the laser light. This measure is intended to achieve an approximately uniform formation of the laser amplification.
  • the object of the invention is to provide a laser system in which the essential characteristic laser properties are improved. In particular, excitation of higher modes and the losses caused thereby are to be reduced or eliminated.
  • the invention provides that the outer, in particular the lateral, boundaries of the active laser medium and / or at least partially (outside the active laser mirror regions required for the desired mode) the end boundaries with a reflection-reducing one for the wavelength of the laser radiation and / or to provide absorptive and / or refractive index-adapted coating relative to the material of the laser-active medium in order to provide a disruptive To prevent back reflection of photons into the laser-active medium.
  • One or more outer boundary surfaces of the active laser medium can also be provided with the coating over the entire surface.
  • the coating which is absorptive for the laser radiation may be transparent to the pump radiation or for the absorptive layer to be removed at the entry points of the pump light.
  • the absorptive layer can have an absorptive effect both for the laser radiation and for the pump radiation.
  • the absorptive and / or reflection-reducing coating can consist of metal, semiconductor material, dielectric material and also of plastic.
  • the materials can be vapor-deposited, sputtered, mechanically applied (in particular sprayed) or applied in some other way.
  • the invention relates to a semiconductor laser diode arrangement (for example laser diodes, laser diode array).
  • a semiconductor laser diode arrangement for example laser diodes, laser diode array.
  • the material of the absorptive and / or reflection-reducing coating has, in particular, germanium or silicon.
  • a dielectric material a metal oxide, a metal or a plastic material for the coating.
  • These materials can for example vapor-deposited, sputtered on, applied epitaxially, galvanically or by spin-coating.
  • the invention relates to a Nd.YAG laser with a Rod crystal as the laser-active medium.
  • the laser can preferably be diode-pumped in the transverse direction.
  • the Nd.YAG laser 1 shown in the figure has a laser-active medium 3 provided in the form of a rod crystal within the laser resonator 2, in which laser resonator 2 the outer boundaries 4 and 5 at least partially have a highly or partially reflecting mirror layer.
  • the lateral boundary surfaces 4 of the laser resonator 2 are provided with a reflection-reducing and / or absorptive coating 6 almost over the entire surface, with the exception of a free entry window 7 for the laser pump radiation 8.
  • the laser light 9 emerges from the laser opening 10 unaffected by the reflection-reducing and / or absorptive coating 6.

Abstract

The invention concerns a laser system with an active material (3) located within a resonator (2) and in which at least part of the outer wall (4, 5) of the resonator has a highly reflecting or partly reflecting mirror. The reflection-reducing and/or absorbent coating (6) comprises a material which cuts down reflection of the laser light (9) and/or absorbs it and/or has a refractive index matched to that of the active material. In addition, the outer wall of the resonator (2) has a window (7) through which pumping radiation (8) can be beamed into the active material, and the reflection-reducing and/or absorbent coating (6) is applied to essentially the whole of the surface of the resonator wall (4, 5), with the exception of the window (7) allowing pumping radiation (8) to be beamed in and with the exception of the laser-light output port (10).

Description

Beschreibung description
Bezeichnung der Erfindung: LasersystemTitle of the invention: laser system
5 Die Erfindung bezieht sich auf ein Lasersystem mit einem in¬ nerhalb eines Laserresonators vorgesehenen laseraktiven Medi¬ um, bei dem die äußeren Begrenzungsflächen des laseraktiven Mediums zumindest teilweise eine hoch- bzw. teilreflektieren¬ de Spiegelanordnung aufweisen.The invention relates to a laser system with a laser-active medium provided within a laser resonator, in which the outer boundary surfaces of the laser-active medium at least partially have a highly or partially reflecting mirror arrangement.
1010
Bei einem solchen Lasersystem bestehen die seitlichen Begren¬ zungen des laseraktiven Mediums im Falle von Gaslasern aus den seitlichen Begrenzungen der Laserkammer, und im Falle von Festkörperlasern aus den seitlichen Begrenzungen des Laser-In such a laser system, the lateral boundaries of the laser-active medium in the case of gas lasers consist of the lateral boundaries of the laser chamber, and in the case of solid-state lasers, the lateral boundaries of the laser chamber.
15 kristalls. Insbesondere an diesen seitlichen Begrenzungen finden Reflexionen von spontan bzw. induziert emittierten Photonen statt, die durch Rückreflexion in das verstärkende laseraktive Medium dort zu Verlusten für den eigentlich ge¬ wünschten Grundmodus sowie zu Instabilitäten (Rauschen) der15 crystals. Reflections of spontaneously or induced emitted photons take place in particular at these lateral boundaries, which due to back reflection into the amplifying laser-active medium there lead to losses for the actually desired basic mode and to instabilities (noise) of the
20 gewünschten Laserstrahlung führen können. Dieser störende Ef¬ fekt ist dann besonders groß, wenn an den Rändern der den Re¬ sonator begrenzenden äußeren Flächen Totalreflexion stattfin¬ det, und das laseraktive Medium hochverstärkend ist. Bei den bisher bekanntgewordenen Lasersystemen wurde die Anregung vonCan lead 20 desired laser radiation. This disturbing effect is particularly great when total reflection takes place at the edges of the outer surfaces delimiting the resonator and the laser-active medium is highly amplifying. In the laser systems that have become known so far, the suggestion of
25 höheren Moden, obwohl häufig unerwünscht, in Kauf genommen oder mittels anderer Maßnahmen unterdrückt. Gleiches gilt für die höheren Schwellen, geringeren Wirkungsgrade, sowie für das Rauschen, welche unter anderem durch die erwähnten Ver- lustmechanismen verursacht werden.25 higher modes, although often undesirable, accepted or suppressed by other measures. The same applies to the higher thresholds, lower efficiencies and noise, which are caused, among other things, by the loss mechanisms mentioned.
30 \30 \
Aus der DE 42 07 824 AI ist em Laserkristall für einen Fest-DE 42 07 824 AI describes a laser crystal for a solid
■ körperlaser oder -Verstärker bekanntgeworden, bei dem der La- serkristall aus einem das Pumplicht nichtabsorbierenden und einem absorbierenden Material mit gleichem Brechungsindex und■ Body laser or amplifier has become known in which the laser crystal consists of a material that does not absorb the pump light and an absorbent material with the same refractive index and
35 thermischem Ausdehnungskoeffizienten schichtweise aufgebaut ist, und diese Schichten nach dem Verfahren des „optischen Kontakts" miteinander verbunden sind. Insbesondere bestehen die Schichten aus dotiertem und undotiertem Material des i gleichen Wirtsgitterkristalls oder Wirtsgitterglases. Durch diese Maßnahme wird neben einer Erhöhung des Wirkungsgrades eine verbesserte Strahlqualität bei vermindertem Kühlungsbe¬ darf des Lasersystems erzielt.35 thermal expansion coefficient built up in layers and these layers are connected to one another by the “optical contact” method. In particular, the layers consist of doped and undoped material of the same host lattice crystal or host lattice glass. This measure not only increases the efficiency, but also improves the beam quality with reduced cooling requirements of the laser system.
Aus der JP-PATENT ABSTRACTS 07111350 A ist ein Festkörperla- ser bekanntgeworden, bei dem der Kernbereich des stabförmigen neodymdotierten YAG-Laserkristalls mit einem Mantelmaterial aus undotiertem YAG-Kristall umgeben ist, welches gegenüber dem Kernmaterial brechungsindexangepaßt ist und im wesentli¬ chen keine Absorption des Anregungslichtes und des Laserlich- tes zuläßt. Durch diese Maßnahme soll eine annähernd gleich¬ förmige Ausbildung der Laserverstärkung erzielt werden.A solid-state laser has become known from JP-PATENT ABSTRACTS 07111350 A, in which the core area of the rod-shaped neodymium-doped YAG laser crystal is surrounded by a cladding material made of undoped YAG crystal, which is matched to the core material by refractive index and essentially does not absorb the Excitation light and the laser light. This measure is intended to achieve an approximately uniform formation of the laser amplification.
Der Erfindung liegt die Aufgabe zugrunde, ein Lasersystem zur Verfügung zu stellen, bei dem die wesentlichen charakteristi- sehen Lasereigenschaften verbessert sind. Insbesondere soll eine Anregung von höheren Moden und die dadurch verursachten Verluste vermindert oder beseitigt werden.The object of the invention is to provide a laser system in which the essential characteristic laser properties are improved. In particular, excitation of higher modes and the losses caused thereby are to be reduced or eliminated.
Diese Aufgabe wird durch ein Lasersystem nach Anspruch 1 ge- löst.Vorteilhafte Weiterbildungen des erfindungsgemäßen La¬ sersystems sind Gegenstand der Unteransprüche 2 bis 7.This object is achieved by a laser system according to claim 1. Advantageous developments of the laser system according to the invention are the subject of subclaims 2 to 7.
Die Erfindung sieht vor, die äußeren, insbesondere die seit¬ lichen Begrenzungen des aktiven Lasermediums und/oder wenig- stens teilweise (außerhalb der für den gewünschten Modus er¬ forderlichen aktiven Laserspiegelbereiche) die stirnseitigen Endbegrenzungen mit einer für die Wellenlänge der Laserstrah- lung reflexionsvermindernden und/oder absorptiven und/oder gegenüber dem Material des laseraktiven Mediums brechungsin- dexangepaßten Beschichtung zu versehen, um eine störende Rückreflexion von Photonen in das laseraktive Medium zu un¬ terbinden. Hierbei ist es für die absorptive Wirkung des auf¬ gebrachten Beschichtungsmaterials von Vorteil, wenn sein Bre¬ chungsindex dem Brechungsindex des Materials des laseraktiven Mediums angepaßt ist, oder, zur Vermeidung von Totalreflexi¬ on, einen etwas größeren Wert als der des laseraktiven Medi¬ ums besitzt.Eine oder mehrere äußere Begrenzungsflächen des aktiven Lasermediums können auch vollflächig mit der Be¬ schichtung versehen sein.The invention provides that the outer, in particular the lateral, boundaries of the active laser medium and / or at least partially (outside the active laser mirror regions required for the desired mode) the end boundaries with a reflection-reducing one for the wavelength of the laser radiation and / or to provide absorptive and / or refractive index-adapted coating relative to the material of the laser-active medium in order to provide a disruptive To prevent back reflection of photons into the laser-active medium. It is advantageous for the absorptive effect of the applied coating material if its refractive index is adapted to the refractive index of the material of the laser-active medium or, in order to avoid total reflection, a somewhat larger value than that of the laser-active medium One or more outer boundary surfaces of the active laser medium can also be provided with the coating over the entire surface.
Wird der Laser optisch gepumpt, kann es insbesondere bei transversaler Pumpanordnung notwendig sein, daß die für die Laserstrahlung absorptive Beschichtung für die Pumpstrahlung durchlässig ist oder die absorptive Schicht an den Eintritts- stellen des Pumplichtes entfernt ist. Bei longitudinaler Pum¬ panordnung kann die absorptive Schicht sowohl für die Laser-, als auch die Pumpstrahlung absorptive Wirkung zeigen.If the laser is pumped optically, it may be necessary, in particular in the case of a transverse pump arrangement, for the coating which is absorptive for the laser radiation to be transparent to the pump radiation or for the absorptive layer to be removed at the entry points of the pump light. With a longitudinal pump arrangement, the absorptive layer can have an absorptive effect both for the laser radiation and for the pump radiation.
Die absorptive und/oder reflexionsvermindernde Beschichtung kann aus Metall, Halbleitermaterial, dielektrischen Material, sowie aus Kunststoff bestehen. Die Materialien können aufge¬ dampft, gesputtert, mechanisch aufgebracht (insbesondere ge¬ spritzt) oder auf sonstige Weise aufgebracht sein.The absorptive and / or reflection-reducing coating can consist of metal, semiconductor material, dielectric material and also of plastic. The materials can be vapor-deposited, sputtered, mechanically applied (in particular sprayed) or applied in some other way.
Bei einer weiteren bevorzugten Ausführungsform bezieht sich die Erfindung auf eine Halbleiterlaserdioden-Anordnung (z. B. Laserdioden, Laserdioden-Array) .Für den Einsatz bei einer Hochleistungslaserdiode weist das Material der absorptiven und/oder reflexionsvermindernden Beschichtung insbesondere Germanium oder Silizium auf.In a further preferred embodiment, the invention relates to a semiconductor laser diode arrangement (for example laser diodes, laser diode array). For use with a high-power laser diode, the material of the absorptive and / or reflection-reducing coating has, in particular, germanium or silicon.
Ebenso eignet sich für Halbleiterlaserdioden ein dielektri¬ sches Material, ein Metalloxyd, ein Metall oder ein Kunst¬ stoffmaterial für die Beschichtung. Diese Materialien können beispielsweise aufgedampft, aufgesputtert, epitaktisch, gal¬ vanisch oder durch Aufschleudern aufgebracht sein.Also suitable for semiconductor laser diodes is a dielectric material, a metal oxide, a metal or a plastic material for the coating. These materials can for example vapor-deposited, sputtered on, applied epitaxially, galvanically or by spin-coating.
Bei einer bevorzugten Anwendung bezieht sich die Erfindung auf einen Nd.YAG-Laser mit einem Rod-Kristall als laserakti¬ ven Medium. Der Laser kann vorzugsweise in transversaler Richtung diodengepumpt sein.In a preferred application, the invention relates to a Nd.YAG laser with a Rod crystal as the laser-active medium. The laser can preferably be diode-pumped in the transverse direction.
Weitere Vorteile und Ausgestaltungen der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbei¬ spiels anhand der Figur.Further advantages and refinements of the invention result from the following description of an exemplary embodiment with reference to the figure.
Der in der Figur dargestellte Nd.YAG-Laser 1 besitzt ein in¬ nerhalb des Laserresonators 2 vorgesehenes laseraktives Medi- um 3 in der Form eines Rod-Kristalles, bei welchem Laserreso¬ nator 2 die äußeren Begrenzungen 4 und 5 wenigstens teilweise eine hoch- bzw. teilreflektierende Spiegelschicht aufweisen. Die seitlichen Begrenzungsflächen 4 des Laserresonators 2 ist mit einer reflexionsvermindernden und/oder absorptiven Be- Schichtung 6 annähernd vollflächig mit Ausnahme eines frei¬ bleibenden Eintrittsfensters 7 für die Laserpumpstrahlung 8 versehen. Das Laserlicht 9 tritt aus der Laseröffnung 10 un¬ beeinflußt von der reflexionsvermindernden und/oder absorpti¬ ven Beschichtung 6 aus. The Nd.YAG laser 1 shown in the figure has a laser-active medium 3 provided in the form of a rod crystal within the laser resonator 2, in which laser resonator 2 the outer boundaries 4 and 5 at least partially have a highly or partially reflecting mirror layer. The lateral boundary surfaces 4 of the laser resonator 2 are provided with a reflection-reducing and / or absorptive coating 6 almost over the entire surface, with the exception of a free entry window 7 for the laser pump radiation 8. The laser light 9 emerges from the laser opening 10 unaffected by the reflection-reducing and / or absorptive coating 6.

Claims

Patentansprüche claims
1. Lasersystem mit einem innerhalb eines Laserresonators (2) vorgesehenen laseraktiven Medium (3) , bei dem die äußeren Be- grenzungsflachen (4, 5) des laseraktiven Mediums (3) wenig¬ stens teilweise eine hoch- bzw. teilreflektierende Spiege¬ lanordnung aufweisen, dadurch gekennzeichnet, daß wenigstens eine der äußeren Begrenzungsflächen (4, 5) des la- seraktiven Mediums (3) mit Ausnahme einer den Austritt des Laserlichtes (9) erlaubenden Laseröffnung (10) zumindest teilweise mit einer Beschichtung (6) aus einem für das Laser¬ licht (9) reflexionsvermindernden und/oder absorptiven Mate¬ rial versehen ist.1. Laser system with a laser-active medium (3) provided within a laser resonator (2), in which the outer boundary surfaces (4, 5) of the laser-active medium (3) at least partially have a highly or partially reflecting mirror arrangement , characterized in that at least one of the outer boundary surfaces (4, 5) of the laser-active medium (3), with the exception of a laser opening (10) allowing the laser light (9) to emerge, is at least partially coated with a coating (6) for the Laser¬ (9) reflection-reducing and / or absorptive material is provided.
2. Lasersystem nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtung (6) ein gegenüber dem Material des laserak¬ tiven Mediums brechungsindexangepaßtes Material aufweist.2. Laser system according to claim 1, characterized in that the coating (6) has a refractive index-matched material compared to the material of the laseractive medium.
3. Lasersystem nach Anspruch 1 oder 2, dadurch gekennzeich¬ net, daß die reflexionsvermindernde und/oder absorptive Be¬ schichtung (6) für eine Laserpumpstrahlung (8) wenigstens teilweise durchlässig ist.3. Laser system according to claim 1 or 2, characterized gekennzeich¬ net that the reflection-reducing and / or absorptive Be¬ coating (6) for a laser pump radiation (8) is at least partially transparent.
4. Lasersystem nach Anspruch 1 oder 2, dadurch gekennzeich¬ net, daß die äußeren Begrenzungsflächen des laseraktiven Me¬ diums (3) ein Eintrittsfenster (7) zur Einstrahlung einer La¬ serpumpstrahlung (8) in das laseraktive Medium aufweisen, und die reflexionsvermindernde und/oder absorptive Beschichtung (6) auf den äußeren Begrenzungsflächen (4, 5) des laserakti¬ ven Mediums (3) mit Ausnahme des Eintrittsfensters (7) zur Einstrahlung der Laserpumpstrahlung (8) und mit Ausnahme der den Austritt des Laserlichtes erlaubenden Laseröffnung (10) wenigstens annähernd vollflächig auf den äußeren Begrenzungs- flächen (4, 5) des laseraktiven Mediums (3) aufgebracht ist. 4. Laser system according to claim 1 or 2, characterized gekennzeich¬ net that the outer boundary surfaces of the laser-active medium (3) have an entrance window (7) for irradiation of a laser pump radiation (8) in the laser-active medium, and the reflection-reducing and / or absorptive coating (6) on the outer boundary surfaces (4, 5) of the laser-active medium (3) with the exception of the entrance window (7) for irradiation of the laser pump radiation (8) and with the exception of the laser opening (10 ) is applied at least approximately over the entire area to the outer boundary surfaces (4, 5) of the laser-active medium (3).
5. Lasersystem nach Anspruch 4, dadurch gekennzeichnet, daß die reflexionsvermindernde und/oder absorptive Beschichtung (6) für die Laserpumpstrahlung (8) wenigstens teilweise un- durchlässig ist.5. Laser system according to claim 4, characterized in that the reflection-reducing and / or absorptive coating (6) for the laser pump radiation (8) is at least partially impermeable.
6. Lasersystem nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß das Material der reflexionsvermindernden und/oder absorp¬ tiven Beschichtung (6) ein Metall, ein Halbleitermaterial, ein dielektrisches Material oder ein Kunststoffmaterial auf¬ weist, welches auf der äußeren Begrenzungsfläche (4, 5) des laseraktiven Mediums (3) aufgedampft, gesputtert oder mecha¬ nisch aufgebracht, insbesondere gespritzt ist.6. Laser system according to claim 1 to 5, characterized in that the material of the reflection-reducing and / or absorbent coating (6) comprises a metal, a semiconductor material, a dielectric material or a plastic material, which on the outer boundary surface (4th , 5) of the laser-active medium (3) is evaporated, sputtered or mechanically applied, in particular sprayed.
7. Lasersystem nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß das Lasersystem ein Nd:YAG-Laser (1) mit einem stabförmi¬ gen Kristall als laseraktives Medium (3) ist. 7. Laser system according to claim 1 to 6, characterized in that the laser system is an Nd: YAG laser (1) with a rod-shaped crystal as a laser-active medium (3).
PCT/DE1996/001500 1995-08-29 1996-08-09 Laser system WO1997008789A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19531756.4 1995-08-29
DE1995131756 DE19531756C1 (en) 1995-08-29 1995-08-29 Neodymium doped YAG laser system

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WO1997008789A2 true WO1997008789A2 (en) 1997-03-06
WO1997008789A3 WO1997008789A3 (en) 1997-04-10

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