DE102013004406A1 - Nonlinear amplifiers - Google Patents
Nonlinear amplifiers Download PDFInfo
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- DE102013004406A1 DE102013004406A1 DE102013004406.5A DE102013004406A DE102013004406A1 DE 102013004406 A1 DE102013004406 A1 DE 102013004406A1 DE 102013004406 A DE102013004406 A DE 102013004406A DE 102013004406 A1 DE102013004406 A1 DE 102013004406A1
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- polarization
- nonlinear
- generated
- polarizing element
- linear
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- 238000000034 method Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 230000010287 polarization Effects 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 16
- 239000010409 thin film Substances 0.000 claims description 5
- 238000001069 Raman spectroscopy Methods 0.000 description 11
- 239000013078 crystal Substances 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- 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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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- 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
- H01S3/08054—Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation
-
- 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
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
-
- 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
- H01S3/094038—End pumping
-
- 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
Abstract
Ein konventioneller Verstärker besteht aus einer Pumpstrahlquelle (11), eine Strahlformungsoptik (12), einem nichtlinearen Medium (41) und einem dichroitischen Strahlteiler (54). Zur Erhöhung der Konversionseffizienz wird ein nichtlinearer Oszillator gebildet. Dabei wird der Pumpstrahl durch einen dichroitischen Umlenkspiegel (54) in den Oszillator eingekoppelt. Der nichtlineare Oszillator wird durch die Spiegel (53), (34) und den Umlenkspiegel (54) gebildet. Wenn jedoch die durch den nichtlinearen Prozess erzeugte Wellenlänge (91) sehr nah an der Pumpwellenlänge (16) liegt so wird es sehr aufwendig einen solchen dichroitischen Umlenkspiegel zu beschichten und somit sehr teuer. Darüber hinaus treten hohe Verlust bei dem dichroitischen Umlenkspiegel auf. Die Kernidee der vorliegenden Erfindung besteht darin, dass mindestens ein polarisierendes Element zur Trennung des durch einen nichtlinearen Prozess erzeugten Strahls von dem Pumpstrahl verwendet wird.A conventional amplifier consists of a pump beam source (11), beam shaping optics (12), a non-linear medium (41) and a dichroic beam splitter (54). A non-linear oscillator is formed to increase the conversion efficiency. The pump beam is coupled into the oscillator through a dichroic deflecting mirror (54). The non-linear oscillator is formed by the mirrors (53), (34) and the deflecting mirror (54). However, if the wavelength (91) generated by the non-linear process is very close to the pump wavelength (16), then it becomes very complex to coat such a dichroic deflecting mirror and therefore very expensive. In addition, large losses occur in the dichroic deflecting mirror. The main idea of the present invention is that at least one polarizing element is used to separate the beam generated by a nonlinear process from the pump beam.
Description
Laserstrahlen werden durch angeregtes Verstärkungsmedium generiert. Die Wellenlänge der Laserstrahlen werden durch die mögliche Übergängen bestimmt und sind in meisten Fällen diskret, wie z. B. 1064 nm bei meisten mit Nd dotierten Lasern und 1030 nm bei meisten mit Yb dotierten Lasern. Auf anderer Seite ist die Wechselwirkung von Laserstrahlen und Materialien wie die Absorption abhängig von der Wellenlänge der Laserstrahlen ab. Eine steuerbare und effiziente Wechselwirkung setzt eine passende Wellenlänge voraus. Um die gerecht zu werden, wird die Wellenlänge der Laserstrahlen durch nichtlineare Prozesse wie Raman-Streuung, Brillouin-Streuung, Up-Konversion, optische parametrische Prozesse (optische parametrische Erzeuger, Verstärker, Oszillator) etc. verändert bzw. angepasst.Laser beams are generated by excited gain medium. The wavelength of the laser beams are determined by the possible transitions and are discrete in most cases, such. 1064 nm for most Nd doped lasers and 1030 nm for most Yb doped lasers. On the other hand, the interaction of laser beams and materials such as the absorption depends on the wavelength of the laser beams. A controllable and efficient interaction requires a suitable wavelength. To cope with this, the wavelength of the laser beams is changed by non-linear processes such as Raman scattering, Brillouin scattering, up-conversion, optical parametric processes (optical parametric generator, amplifier, oscillator), etc.
Unter Verwendung des Raman-Prozesses in einem KGW Kristallen kann z. B. die Wellenlänge von 559 nm durch Pumpen mit 532 nm generiert werden. Die Wellenlänge 532 nm und die durch Raman-Prozess generierte Wellenlänge 559 nm liegt sehr nah beieinander. Noch enger liegen die Pumpwellenlänge und die durch Brillouin-Streuung-Prozess generierte Wellenlänge bei einander. Zur Trennung der durch nichtlineare Prozesse wie Raman-Streuung und Brillouin-Streuung erzeugten Wellenlängen von der Pumpwellenlänge zu trennen werden dichroitische Optiken verwendet. Die dichroitischen Optiken weisen unterschiedliche Reflexion bzw. Transmission für unterschiedliche Wellenlängen auf. Allerdings ist die Beschichtung der Optiken sehr komplex und aufwendig, wenn die zu trennenden Wellenlänge eng beieinander sind. Auch das erzielbare Trennungsverhältnis limitiert.Using the Raman process in a KGW crystal, z. For example, the wavelength of 559 nm can be generated by pumping at 532 nm. The 532 nm wavelength and the 559 nm wavelength generated by the Raman process are very close together. Even closer are the pump wavelength and the wavelength generated by the Brillouin scattering process. For separating the wavelengths generated by nonlinear processes such as Raman scattering and Brillouin scattering from the pump wavelength, dichroic optics are used. The dichroic optics have different reflection or transmission for different wavelengths. However, the coating of the optics is very complex and expensive if the wavelength to be separated are close together. Also limits the achievable separation ratio.
Um das Problem zu vermeiden, werden in dieser vorliegenden Anmeldung nichtlineare Verstärker angeben, bei denen die Trennung der durch nichtlineare Prozessen Wellenlängen von der Pumpwellenlänge unter Verwendung von mindestens einem polarisierenden Element erfolgt.In order to avoid the problem, non-linear amplifiers will be used in this application in which the separation of the wavelengths from the pump wavelength by non-linear processes is performed using at least one polarizing element.
Wie in
Die Kernidee der vorliegenden Erfindung besteht darin, dass mindestens ein polarisierendes Element zur Trennung der durch einen nichtlinearen erzeugten Prozess erzeugten Wellenlängen von der Pumpwellenlänge verwendet wird.The core idea of the present invention is that at least one polarizing element is used to separate the wavelengths generated by a non-linear generated process from the pump wavelength.
Ein derartiger nichtlinearer Verstärker zeigt
Für den Fall, dass der erzeugte Strahl die gleiche Polarisation von dem Pumpstrahl aufweist, kann ein polarisationsänderndes Element (
Für den Fall, dass der durch den nichtlinearen Prozess erzeugte Strahl die gleiche Polarisation wie die des Pumpstrahls, wird ein polarisationsänderndes Element (
Bei nichtlinearen Prozessen wie Raman-Streuung und Brillouin-Streuung sind Kettenprozesse möglich. Das heißt, der erzeugte Strahl wiederrum als Pumpstrahl wirkt und damit Strahlen mit neuen anderen Wellenlängen generiert. Damit wird es möglich, Strahlen mit unterschiedlichen Wellenlängen, die dem jeweiligen nichtlinearen Prozess unterschiedlicher Ordnung entsprechen. Zum Beispiel: mit 532 nm pumpte KGW Raman-Oszillator ist die Wellenlänge erster Ordnung 559 nm und die Wellenlänge der zweiten Ordnung 589 nm. Wenn nur die Wellenlänge 559 nm gewünscht ist, muss die Oszillation bei der Wellenlänge 589 nm vermieden bzw. unterdrückt werden.In nonlinear processes such as Raman scattering and Brillouin scattering, chain processes are possible. This means that the generated beam acts as a pump beam again and thus generates beams with new other wavelengths. This makes it possible to have beams with different wavelengths which correspond to the respective nonlinear process of different order. For example: KGW Raman oscillator pumped at 532 nm is the first order wavelength 559 nm and the second order wavelength 589 nm. If only the 559 nm wavelength is desired, the oscillation at the 589 nm wavelength must be avoided or suppressed.
Wie
Zur erhöhten Unterdrückung der unerwünschten Oszillation können mehr als eine Kombination von polarisierenden Elementen (
Eine vorteilhafte Ausführung von nichtlinearen Oszillatoren ergibt sich, wenn der Pumpstrahl und der zu erzeugende Strahl innerhalb eines gemeinsamen Oszillator integriert wird. Der Pumpstrahl wird von dem Lasermedium (
Claims (7)
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DE102013004406.5A DE102013004406B4 (en) | 2013-03-16 | 2013-03-16 | Nonlinear Amplifiers |
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DE102013004406.5A DE102013004406B4 (en) | 2013-03-16 | 2013-03-16 | Nonlinear Amplifiers |
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DE102013004406A1 true DE102013004406A1 (en) | 2014-10-30 |
DE102013004406B4 DE102013004406B4 (en) | 2023-05-11 |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6047011A (en) * | 1996-07-04 | 2000-04-04 | The Secretary Of State For Defence In Her Majesty's Government Of The United Kingdom Of Great Britian And Northern Ireland | Optical harmonic generator |
DE10122010A1 (en) * | 2000-05-08 | 2002-01-10 | Fraunhofer Ges Forschung | Multiplexing/demultiplexing arrangement, has polarizing element; waves enter element linearly polarized; statistically polarized waves are separated into two linearly polarized waves |
US20020176644A1 (en) * | 2001-03-16 | 2002-11-28 | Bhagavatula Venkata A. | Polarization combiner/splitter |
DE10130845A1 (en) * | 2001-06-28 | 2003-01-16 | Keming Du | Optical arrangement for non-linear frequency conversion has doubly refracting beam displacer(s) for combining or separating fundamental waves and/or coupling out waves produced |
US20030228082A1 (en) * | 2002-06-11 | 2003-12-11 | Jds Uniphase Corporation | Tunable micro-optic architecture for combining light beam outputs of dual capillary polarization-maintaining optical fibers |
US20050259325A1 (en) * | 2002-04-24 | 2005-11-24 | Silvia Ghidini | Optical devices comprising series of birefringent waverplates |
US20080056642A1 (en) * | 2006-09-01 | 2008-03-06 | Mobius Photonics, Inc. | Reducing thermal load on optical head |
DE102009011599A1 (en) * | 2009-03-08 | 2010-09-16 | Du, Keming, Dr. | Oscillator-amplifier-arrangement comprises oscillator, amplifier stage and optical component which is arranged between oscillator and amplifier for modification of capacity or pulse energy of beam from oscillator-amplifier |
KR20110029666A (en) * | 2009-09-16 | 2011-03-23 | 한국원자력연구원 | Serial-stage optical parametric amplifier using nonlinear crystals |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4111835A1 (en) | 1991-04-11 | 1992-10-15 | Eltro Gmbh | RAMANLASER |
DE10327260A1 (en) | 2003-06-17 | 2005-01-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Beam-folding optical amplification equipment for solid state laser, includes component with selective angular sensitivity |
-
2013
- 2013-03-16 DE DE102013004406.5A patent/DE102013004406B4/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6047011A (en) * | 1996-07-04 | 2000-04-04 | The Secretary Of State For Defence In Her Majesty's Government Of The United Kingdom Of Great Britian And Northern Ireland | Optical harmonic generator |
DE10122010A1 (en) * | 2000-05-08 | 2002-01-10 | Fraunhofer Ges Forschung | Multiplexing/demultiplexing arrangement, has polarizing element; waves enter element linearly polarized; statistically polarized waves are separated into two linearly polarized waves |
US20020176644A1 (en) * | 2001-03-16 | 2002-11-28 | Bhagavatula Venkata A. | Polarization combiner/splitter |
DE10130845A1 (en) * | 2001-06-28 | 2003-01-16 | Keming Du | Optical arrangement for non-linear frequency conversion has doubly refracting beam displacer(s) for combining or separating fundamental waves and/or coupling out waves produced |
US20050259325A1 (en) * | 2002-04-24 | 2005-11-24 | Silvia Ghidini | Optical devices comprising series of birefringent waverplates |
US20030228082A1 (en) * | 2002-06-11 | 2003-12-11 | Jds Uniphase Corporation | Tunable micro-optic architecture for combining light beam outputs of dual capillary polarization-maintaining optical fibers |
US20080056642A1 (en) * | 2006-09-01 | 2008-03-06 | Mobius Photonics, Inc. | Reducing thermal load on optical head |
DE102009011599A1 (en) * | 2009-03-08 | 2010-09-16 | Du, Keming, Dr. | Oscillator-amplifier-arrangement comprises oscillator, amplifier stage and optical component which is arranged between oscillator and amplifier for modification of capacity or pulse energy of beam from oscillator-amplifier |
KR20110029666A (en) * | 2009-09-16 | 2011-03-23 | 한국원자력연구원 | Serial-stage optical parametric amplifier using nonlinear crystals |
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