DE102004008673A1 - Narrow band emitting laser arrangement with a Faraday rotator switch for switching between given laser wavelengths - Google Patents
Narrow band emitting laser arrangement with a Faraday rotator switch for switching between given laser wavelengths Download PDFInfo
- Publication number
- DE102004008673A1 DE102004008673A1 DE200410008673 DE102004008673A DE102004008673A1 DE 102004008673 A1 DE102004008673 A1 DE 102004008673A1 DE 200410008673 DE200410008673 DE 200410008673 DE 102004008673 A DE102004008673 A DE 102004008673A DE 102004008673 A1 DE102004008673 A1 DE 102004008673A1
- Authority
- DE
- Germany
- Prior art keywords
- emitting laser
- faraday rotator
- narrow
- switching
- band emitting
- 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.)
- Granted
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
- H01S3/08022—Longitudinal modes
- H01S3/08031—Single-mode emission
- H01S3/08036—Single-mode emission using intracavity dispersive, polarising or birefringent 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
- 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
- H01S3/0604—Crystal lasers or glass lasers in the form of a plate or disc
-
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
-
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/163—Solid materials characterised by a crystal matrix
- H01S3/164—Solid materials characterised by a crystal matrix garnet
- H01S3/1643—YAG
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
Description
Die Erfindung betrifft eine schmalbandig emittierende Laseranordnung gemäß der Gattung der Patentansprüche, insbesondere einen Festkörperlaser oder einen Farbstofflaser. Derartige Laseranordnungen kommen zur Anwendung in der Laserspektroskopie, bspw. bei der lasergestützten Diagnostik der physikalischen und chemischen Vorgänge bei Verbrennungsprozessen.The The invention relates to a narrow band emitting laser arrangement according to the genus of the claims, in particular a solid-state laser or a dye laser. Such laser arrangements come to Application in laser spectroscopy, for example in laser-based diagnostics the physical and chemical processes in combustion processes.
Bekanntlich
werden zur Begrenzung der Bandbreite der von einem Laser emittierten
Strahlung hochauflösende
Reflexionsgitter eingesetzt (Lambda-Physik, Excimerlaser Compex
150T, 1993). Will man diese Laser bei zwei unterschiedlichen Wellenlängen betreiben,
die schnell gewechselt werden sollen (alternierender Zwei-Wellenlängen-Betrieb),
so bewegt man das Reflexionsgitter mit einem Piezoversteller zwischen
zwei Lagen, die den durch die Anwendung vorgegebenen Wellenlängen entsprechen,
siehe
Der vorliegenden Erfindung liegt daher die Aufgabe zu Grunde, eine schmalbandig emittierende Laseranordnung zu schaffen, die ohne bewegte Teile und mit geringem Aufwand die Wellenlängenumschaltung von einer Wellenlänge zu einer anderen nach einem vorgegebenen Regime ermöglicht.Of the The present invention is therefore based on the object, a narrowband To provide emitting laser assembly without moving parts and with little effort the wavelength switching from one wavelength to one others according to a predetermined regime allows.
Gemäß der Erfindung wird diese Aufgabe durch die kennzeichnenden Merkmale des ersten Patentanspruchs gelöst und durch vorteilhafte Ausgestaltungen gemäß den Unteransprüchen ergänzt. Die Anwendung des optischen Faraday-Effektes vermeidet jegliche mechanisch beweglichen Teile und lässt die Bestromung des Faraday-Rotators auch in mehr als zwei Stufen zu. Dabei ist der Faraday-Rotator vorzugsweise zwischen den als doppelbrechendes Filter und als Etalon ausgebildeten frequenzselektiven Elementen angeordnet. Diese Kombination ermöglicht das Anschwingen einer einzigen longitudinalen Lasermode und damit eine extrem schmale Bandbreite der emittierten Strahlung (Δλ << 1pm). Die Verwendung des doppelbrechenden Filters unter dem Brewsterwinkel führt zur Emission von linear polarisierter Strahlung. Zusätzlich kann durch Drehung des doppelbrechenden Filters um dessen Flächennormale die Wellenlänge des verwendeten Lasers durchgestimmt werden. Da einerseits nur geringe, im Gradbereich liegende Drehwinkel benötigt werden und andererseits eine schnelle, externe Ansteuerung erfolgen soll, weist der Faraday-Rotator einen aktivierbaren bzw. deaktivierbaren Magneten, im Gegensatz zum allgemein gebräuchlichen Permanentmagneten auf. Der Faraday-Rotator besteht deshalb aus einer entsprechend dimensionierten Spule (Elektromagnet), die einen geeigneten Kristall umgibt. Dieser dreht bei Stromdurchfluss in Abhängigkeit von dessen Stromstärke die Polarisationsebene der linear polarisierten Strahlung in gewünschter Weise um einen definierten Betrag; mit der Drehung ist eine Wellenlängenverschiebung entsprechend dem Modenabstand des eingesetzten Etalons verbunden. Bei einem an die Spule angelegten Strom von etwa 1 A ergibt sich eine Wellenlängenverschiebung von etwa 100 pm. Als laserndes Element kann eine Yb:YAG-Scheibe benutzt werden.According to the invention This task is characterized by the characterizing features of the first Patent claim solved and supplemented by advantageous embodiments according to the subclaims. The Application of the optical Faraday effect avoids any mechanically moving Parts and leaves the energization of the Faraday rotator in more than two stages to. In this case, the Faraday rotator is preferably between the as birefringent filter and etalon-trained frequency-selective Arranged elements. This combination allows the oscillation of a single longitudinal laser mode and thus an extremely narrow Bandwidth of the emitted radiation (Δλ << 1pm). The use of the birefringent filter under the Brewster angle leads to Emission of linearly polarized radiation. In addition, by turning the birefringent filter around its surface normal the wavelength of the used laser to be tuned. Since on the one hand only small, in the degree range angle of rotation are needed and on the other hand a fast, external control should be made, the Faraday rotator an activatable or deactivatable magnet, in contrast to the common ones Permanent magnets on. The Faraday rotator therefore consists of a appropriately sized coil (electromagnet), which is a suitable Crystal surrounds. This turns depending on current flow of its current strength the polarization plane of the linearly polarized radiation in the desired Way to a defined amount; with the rotation is a wavelength shift connected according to the mode spacing of the etalon used. When applied to the coil current of about 1 A results a wavelength shift of about 100 pm. The laser element can be a Yb: YAG disk to be used.
Die Erfindung betrifft insbesondere auch Laser mit geringer Kleinsignalverstärkung, bei denen das bekannte Verfahren der Wellenlängenumschaltung durch Bewegung des Reflexionsgitters nicht anwendbar ist. Bei entsprechender Auslegung der das Magnetfeld erzeugenden Spule (Material, Aufbau, Geometrie) sowie der elektrisch/elektronischen Ansteuerung lässt sich eine Folgefrequenz für den alternierenden Zwei-Wellenlängen-Betrieb der erfindungsgemäßen Anordnung von bis in den kHz-Bereich erreichen.The In particular, the invention also relates to lasers with low signal amplification which the known method of wavelength switching by movement of the reflection grating is not applicable. With appropriate design the magnetic field generating coil (material, structure, geometry) as well as the electrical / electronic control can be a repetition frequency for the alternating two-wavelength operation the inventive arrangement from reaching into the kHz range.
Die Erfindung wird nachstehend an Hand der schematischen Zeichnung näher erläutert. Es zeigen:The Invention will be explained in more detail below with reference to the schematic drawing. It demonstrate:
In
Der
Faraday-Rotator
Als
Kristall
Zur
Spule
Tabelle: Table:
Aus der Tabelle ist ersichtlich, dass durch die Erhöhung des Tastverhältnisses von 1:2 auf 1:20 die maximale Stromdichte von 9,5 Amm-2 auf 100 Amm-2 erhöht werden kann, während die thermische Belastung gleich bleibt. Es werden höhere Frequenzen bei kleineren Zeitkonstanten erreicht. Mit den erreichbaren Magnetfeldern von z. B. 100 mT bei einem Spulenstrom von 1,4 A werden die gewünschten Wellenlängenumschaltungen ermöglicht. Die Parameter der Spule ergeben sich aus den geometrischen und physikalischen Dimensionen des Kristalls.From the table it can be seen that increasing the duty cycle from 1: 2 to 1:20 can increase the maximum current density from 9.5 Amm -2 to 100 Amm -2 while the thermal load remains the same. Higher frequencies are achieved with smaller time constants. With the achievable mag fields of z. B. 100 mT at a coil current of 1.4 A, the desired wavelength switching possible. The parameters of the coil result from the geometric and physical dimensions of the crystal.
In
Alle in der Beschreibung, den nachfolgenden Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.All in the description, the following claims and the drawing Features can both individually and in any combination with each other invention essential be.
- 1010
- Laseranordnunglaser assembly
- 1111
- laserndes Elementlasing element
- 1212
- Laserstrahllaser beam
- 1313
- doppelbrechendes Filterbirefringent filter
- 1414
- Faraday-RotatorFaraday rotator
- 1515
- Etalonetalon
- 1616
- Auskopplungsspiegeloutcoupling mirror
- 1717
- Ansteuerelektronikcontrol electronics
- 18, 2118 21
- Anschlüsseconnections
- 1919
- Kondensatorcapacitor
- 2020
- Diodediode
- 2222
- Masseanschlussground connection
- 2323
- Anpassungswiderstandmatching resistor
- 2424
- MasseDimensions
- 2525
- Transistortransistor
- 2626
- Leistungstransistorpower transistor
- 2727
- Messwiderstandmeasuring resistor
- 2828
- Anschlussbuchsesocket
- 2929
- Masseanschlussground connection
- 3030
- Messgerätgauge
- 3131
- Pulsgeneratorpulse generator
- 3232
- Mess- und Auswerteeinheitmeasurement and evaluation unit
- 131, 132131 132
- planparallele Plattencoplanar plates
- 141141
- SpuleKitchen sink
- 142142
- Kristallcrystal
- 310310
- Impulspulse
- 311, 312311 312
- Impulsflankenpulse edges
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410008673 DE102004008673B4 (en) | 2004-02-20 | 2004-02-20 | Narrow-band emitting laser arrangement with switching between predefinable laser wavelengths |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410008673 DE102004008673B4 (en) | 2004-02-20 | 2004-02-20 | Narrow-band emitting laser arrangement with switching between predefinable laser wavelengths |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE102004008673A1 true DE102004008673A1 (en) | 2005-09-15 |
| DE102004008673B4 DE102004008673B4 (en) | 2011-07-28 |
Family
ID=34853598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE200410008673 Expired - Fee Related DE102004008673B4 (en) | 2004-02-20 | 2004-02-20 | Narrow-band emitting laser arrangement with switching between predefinable laser wavelengths |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102004008673B4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668682A (en) * | 2019-03-07 | 2020-09-15 | 中国科学院化学研究所 | Liquid laser with adjustable output wavelength, preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3473031A (en) * | 1965-06-23 | 1969-10-14 | Philco Ford Corp | Laser transmitter for generation of simultaneous frequency modulated and unmodulated beams |
| EP0355566A2 (en) * | 1988-08-18 | 1990-02-28 | Harmonic Lightwaves, Inc. | Tunable single-frequency ring laser |
| DE10127014A1 (en) * | 2001-06-01 | 2002-12-12 | Zeiss Carl Jena Gmbh | Variable wavelength laser |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4975918A (en) * | 1989-06-07 | 1990-12-04 | Maxwell Laboratories, Inc. | Tunable laser |
-
2004
- 2004-02-20 DE DE200410008673 patent/DE102004008673B4/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3473031A (en) * | 1965-06-23 | 1969-10-14 | Philco Ford Corp | Laser transmitter for generation of simultaneous frequency modulated and unmodulated beams |
| EP0355566A2 (en) * | 1988-08-18 | 1990-02-28 | Harmonic Lightwaves, Inc. | Tunable single-frequency ring laser |
| DE10127014A1 (en) * | 2001-06-01 | 2002-12-12 | Zeiss Carl Jena Gmbh | Variable wavelength laser |
Non-Patent Citations (1)
| Title |
|---|
| Zietze, U., Schenk, Ch.: Halbleiterschaltungs- technik. Sechste neu bearbeitete und erweiterte Auflage, Springer Verlag, Heidelberg,1983,S.64-66 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668682A (en) * | 2019-03-07 | 2020-09-15 | 中国科学院化学研究所 | Liquid laser with adjustable output wavelength, preparation method and application thereof |
| CN111668682B (en) * | 2019-03-07 | 2021-11-12 | 中国科学院化学研究所 | Liquid laser with adjustable output wavelength and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004008673B4 (en) | 2011-07-28 |
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|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8127 | New person/name/address of the applicant |
Owner name: INSTITUT FUER PHOTONISCHE TECHNOLOGIEN E.V., 0, DE |
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| R018 | Grant decision by examination section/examining division | ||
| R020 | Patent grant now final |
Effective date: 20111029 |
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| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
| R082 | Change of representative |
Representative=s name: PATENT- UND RECHTSANWALTSKANZLEI BOCK BIEBER D, DE |
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| R081 | Change of applicant/patentee |
Owner name: LEIBNIZ-INSTITUT FUER PHOTONISCHE TECHNOLOGIEN, DE Free format text: FORMER OWNER: INSTITUT FUER PHOTONISCHE TECHNOLOGIEN E.V., 07745 JENA, DE Effective date: 20140904 |
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| R082 | Change of representative |
Representative=s name: PATENT- UND RECHTSANWALTSKANZLEI BOCK BIEBER D, DE Effective date: 20140904 |
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| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20140902 |