Patents by Inventor Andreas Tuennermann
Andreas Tuennermann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20140002893Abstract: The invention relates to a fiber amplifier system for amplifying and emitting pulsed radiation, having a master source (1) which emits pulsed output radiation, and at least one amplifier stage (4), which is arranged after the master source (1) in the direction of radiation, and which amplifies the output radiation. The aim of the invention is to provide a fiber amplifier system for amplifying and emitting pulsed radiation which avoids stimulated Brillouin scattering as effectively as possible and at the same time can be produced simply and inexpensively. To this end, the output radiation emitted by the master source (1) is broadband and is generated substantially by means of spontaneous emission.Type: ApplicationFiled: November 25, 2011Publication date: January 2, 2014Applicants: FRIEDRICH-SCHILLER-UNIVERSITAET JENA, FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Dirk Nodop, Jens Limpert, Andreas Tuennermann
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Publication number: 20130235448Abstract: The invention relates to an optical amplifier arrangement for amplifying ultra-short pulsed laser radiation comprising a mode-locked laser (1) and two or more optical amplifiers (3) arranged downstream of the laser (1) in the propagation direction of the laser radiation. Optical amplifier arrangements of this type are known in the prior art. Here the intention is to present an alternative to the known amplifier arrangements. The invention proposes arranging between the laser (1) and the optical amplifiers (3) at least one splitting element (2) which splits the pulsed laser radiation between a plurality of amplifier channels (4), wherein each amplifier channel (4) has at least one optical amplifier (3), and wherein at least one common combination element (5) is disposed downstream of the amplifier channels (4) and coherently superimposes the pulsed laser radiation amplified in the amplifier channels (4).Type: ApplicationFiled: August 29, 2011Publication date: September 12, 2013Applicants: FRIEDRICH-SCHILLER-UNIVERSITAET JENA, FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Arno Klenke, Enrico Seise, Jens Limpert, Andreas Tuennermann
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Publication number: 20130083814Abstract: The invention relates to a laser system with a passively Q-switched laser 1, a spectrally widening element 3, and a compression element 4. Laser systems of this kind are utilized for generating ultra-short laser pulses. Systems, mode-coupled solid-state lasers known from prior art allow for generating laser pulses in the sub-10 ps range only with complicated and alignment-sensitive free-beam arrangements. Therefore, it is the object of the present invention to create a laser system that generates pulse durations of less than 10 ps and which is simple and compact to produce at the same time. In order to achieve this object, the present invention proposes that the passively Q-switched laser 1 is provided with a longitudinally monomode output radiation which is spectrally widened by means of the spectrally widening element 3 by self-phase modulation and is temporally compressed by the compression element 4.Type: ApplicationFiled: April 13, 2011Publication date: April 4, 2013Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V., FRIEDRICH-SCHILLER-UNIVERSITAET JENAInventors: Dirk Nodop, Alexander Steinmetz, Jens Limpert, Andreas Tuennermann
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Publication number: 20120237162Abstract: The invention relates to a transverse mode filter in an optical waveguide (3). The aim of the invention is to produce a transverse mode filter that permits a monolithic construction of a laser in a multi-mode waveguide. To achieve this, according to the invention the filter comprises a Fabry-Perot cavity integrated into the optical waveguide (3) and comprising two reflective elements (5) situated at a distance from one another. In addition, the waveguide (3) is modified in the region of the Fabry-Perot cavity and/or in the region of the reflective elements (5) in relation to the remaining regions of the waveguide with respect to the effective refractive index of at least one mode of the waveguide.Type: ApplicationFiled: September 15, 2010Publication date: September 20, 2012Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWAN, FRIEDRICH-SCHILLER-UNIVERSITAET JENAInventors: Jens Ulrich Thomas, Christian Voigtlaender, Stefan Nolte, César Jáuregui Misas, Fabian Stutzki, Jens Limpert, Andreas Tuennermann
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Publication number: 20120229888Abstract: The invention relates to a laser device (1) for amplifying and/or transporting electromagnetic radiation, comprising a radiation source (2) for generating the electromagnetic radiation and an amplifier (4) for amplifying or a medium for transporting the generated electromagnetic radiation. In order to make available a device (1) for amplifying or transporting electromagnetic radiation that provides a very easy to implement possibility for reducing the influence of non-linear effects, the electromagnetic radiation propagating in the amplifier (4) or medium is largely non-linearly polarized.Type: ApplicationFiled: July 9, 2010Publication date: September 13, 2012Applicants: FRIEDRICH-SCHILLER-UNIVERSITAET JENA, FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Jens Limpert, Andreas Tuennermann, Damian Schimpf, Tino Eidam, Enrico Seise, Fabian Roeser
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Patent number: 8238386Abstract: It is an object of the present invention to provide a compact and low-cost system for generating ultra short high energy laser light pulses that does not use the known CPA scheme. The proposed approach is based on spectral filtering of laser light pulses of a mode locked laser source. The used mode locked laser source can be of any kind as long as its filtered residual pulse bandwidth supports pulse durations longer than 20 ps and up to 1 ns. After filtering the laser light pulses are directly amplified in an amplification element consisting of one or more amplification stages. At the same time or just after amplification the light pulses are spectrally broadened through a spectral broadening element, for example a fiber of suitably chosen core diameter and length to achieve a spectral bandwidth that is wide enough to support sub 10 ps pulses. Finally, the spectrally broadened laser light pulses are compressed by a compact dispersive element consisting of one or more Bragg gratings or a grating pair.Type: GrantFiled: May 21, 2010Date of Patent: August 7, 2012Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.Inventors: Jens Limpert, Andreas Tuennermann
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Patent number: 8217483Abstract: A semiconductor component that includes a photosensitive doped semiconductor layer, in which electrical charge carriers are released during absorption of electromagnetic radiation is disclosed. The photosensitive semiconductor layer has a structured interface and at least one layer which generates an electric field for separating the released charge carriers disposed downstream of the structured interface. The electric field extends over the structured interface. The photosensitive semiconductor component is distinguished by a high efficiency of the charge carrier separation, in particular, for generating an electric current.Type: GrantFiled: November 24, 2009Date of Patent: July 10, 2012Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E. V.Inventors: Kevin Fuechsel, Andreas Tuennermann, Ernst-Bernhard Kley
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Publication number: 20120069428Abstract: The invention relates to an optical fiber as an optical waveguide for the single-mode operation. The present invention proposes a fiber having a microstructure, by which the propagation of modes of a higher order are selectively suppressed in the optical waveguide. At the same time, the propagation of transversal modes of a higher order is dampened more strongly than the propagation of the fundamental modes of the optical waveguide.Type: ApplicationFiled: March 12, 2010Publication date: March 22, 2012Applicants: FRIEDRICH-SCHILLER-UNIVERSITÄT JENA, FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Jens Limpert, Fabian Roeser, Tino Eidam, César Jáuregui Misas, Andreas Tuennermann
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Publication number: 20120050843Abstract: The present invention relates to a device (12) and to a method for amplifying light impulses (13). The device comprises a stretcher (15) stretching the light impulses over time, at least one amplifier (16) amplifying the stretched light impulses, and a compressor (17) compressing the stretched and amplified light impulses, wherein the amplifier (16) applies a non-linear phase generated by self-phase modulation to the stretched light impulses. In order to provide a device and a method for amplifying light impulses, by means of which light impulses having higher light impulse quality and light impulse peak power can be generated, the invention proposes that means for spectrally shaping the light impulses are disposed ahead of the amplifier (16) in the beam path, wherein the means for spectrally shaping the light impulses bring about a spectral trimming of the light impulses.Type: ApplicationFiled: December 23, 2009Publication date: March 1, 2012Applicants: Friedrich-Schiller-Universitaet Jena, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.Inventors: Jens Limpert, Enrico Seise, Damian Schimpf, Fabian Roeser, Andreas Tuennermann
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Publication number: 20110286479Abstract: It is an object of the present invention to provide a compact and low-cost system for generating ultra short high energy laser light pulses that does not use the known CPA scheme. The proposed approach is based on spectral filtering of laser light pulses of a mode locked laser source. The used mode locked laser source can be of any kind as long as its filtered residual pulse bandwidth supports pulse durations longer than 20 ps and up to 1 ns. After filtering the laser light pulses are directly amplified in an amplification element consisting of one or more amplification stages. At the same time or just after amplification the light pulses are spectrally broadened through a spectral broadening element, for example a fiber of suitably chosen core diameter and length to achieve a spectral bandwidth that is wide enough to support sub 10 ps pulses. Finally, the spectrally broadened laser light pulses are compressed by a compact dispersive element consisting of one or more Bragg gratings or a grating pair.Type: ApplicationFiled: May 21, 2010Publication date: November 24, 2011Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Jens Limpert, Andreas Tuennermann
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Publication number: 20110242646Abstract: The present invention relates to a device (1, 11) for amplifying light pulses (2, 12), the device comprised of a stretcher (4, 14) which temporally stretches the light pulses (2, 12), and comprised of at least one amplifier (5, 15) which amplifies the stretched light pulses (2, 12), and comprised of a compressor (6, 16) which recompresses the stretched and amplified light pulses (2, 12), the stretcher (4, 14) and the compressor (6, 16) being dispersive elements with essentially oppositely identical dispersion. To provide a device (1, 11) for amplifying light pulses (2, 12) which is of a compact setup and which can be flexibly applied, the present invention proposes that the dispersion of the amplifier (5, 15), the dispersion of further optical elements of the device (1) and/or a mismatch of dispersion of the stretcher (4, 14) and compressor (6, 16) are at least partly compensated by self-phase modulation of the light pulses (2, 12) and/or by at least one additional element (17) of variable dispersion.Type: ApplicationFiled: September 11, 2009Publication date: October 6, 2011Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Friedrich-Schiller-Universitaet JenaInventors: Damian Schimpf, Jens Limpert, Andreas Tuennermann
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Publication number: 20100304151Abstract: The present invention relates to a method for laser-assisted bonding of substrates, in which these are connected together firstly frictionally by pressing together and subsequently strengthening of the connection between the substrates is effected by activation in regions which is induced by laser irradiation. The invention likewise relates to substrates produced accordingly.Type: ApplicationFiled: February 21, 2008Publication date: December 2, 2010Applicant: Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.Inventors: Andreas Tuennermann, Ramona Eberhardt, Gerhard Kalkowski, Stefan Nolte
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Publication number: 20100288422Abstract: The present invention relates to a method for joining two or more components made of glass, ceramic, and/or glass ceramic, using a soluble glass joining solution having sodium, potassium, and/or lithium ions and/or a silica sol, the joining solution being applied to joint surfaces between the components to be joined and solidified at mild temperatures, the method being either characterized in that the joining solution comprises an additive selected among boric acid, boron compounds from which boric acid can result by hydrolysis, aluminum acetates, aluminum silicate/NH3/H2O titanium compounds forming titanium hydroxy cations, water-soluble zinc compounds, water-soluble zircon compounds, and water-soluble yttrium compounds, wherein said additive is added in an amount that reduces the pH value of the underlying soluble glass, and/or characterized in that, after the joining solution is applied and the components to be joined are brought together and fixed, the joined components are dried by removing water at roomType: ApplicationFiled: December 12, 2008Publication date: November 18, 2010Inventors: Manfred Krauss, Gudrun Leopoldsberger, Gerhard Kalkowski, Ramona Eberhardt, Andreas Tuennermann, Charlotte Jahnke, Simone Fabian
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Publication number: 20100133639Abstract: A semiconductor component that includes a photosensitive doped semiconductor layer, in which electrical charge carriers are released during absorption of electromagnetic radiation is disclosed. The photosensitive semiconductor layer has a structured interface and at least one layer which generates an electric field for separating the released charge carriers disposed downstream of the structured interface. The electric field extends over the structured interface. The photosensitive semiconductor component is distinguished by a high efficiency of the charge carrier separation, in particular, for generating an electric current.Type: ApplicationFiled: November 24, 2009Publication date: June 3, 2010Inventors: Kevin Fuechsel, Andreas Tuennermann, Ernst-Bernhard Kley
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Patent number: 6697394Abstract: A directly modulatable laser comprising an active medium inside a laser cavity formed by a resonator mirror and an out-coupling mirror, and a pump light source exciting the active medium. It is characterized in that the active medium generates radiation of two wavelengths (&lgr;1 and &lgr;2) and the resonator mirror is constructed as a controllable reflector by which the reflectivity is controllable for each of the two wavelengths (&lgr;1 and &lgr;2) and the controllable reflector is connected with a control unit, wherein the reflection factor is controlled in such a way that the inversion density of the electrons which is generated in the active medium is constant and the light output of one of the wavelengths ((&lgr;1) is controllable between a minimum value and a maximum value according to an applied control signal, wherein the control of the two wavelengths ((&lgr;1 and &lgr;2) is carried out in push-pull.Type: GrantFiled: February 9, 2001Date of Patent: February 24, 2004Assignee: Jenoptik LDT GmbHInventors: Andreas Tuennermann, Holger Zellmer, Jens-Peter Ruske
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Publication number: 20020018287Abstract: A fiber-optic amplifier comprising a laser source which emits signal radiation in a narrow band on one or more wavelengths in a first end of an amplifier fiber, and amplified signal radiation can be coupled out at a second end of the amplifier fiber. The amplifier fiber is a double-core fiber with a pump core and a laser core and the latter is end pumped or side pumped. The amplifier fiber is a multimode double-core fiber at which or within which is arranged, in the area of its first end, an element for transverse mode selection which suppresses modes higher than the fundamental mode.Type: ApplicationFiled: February 27, 2001Publication date: February 14, 2002Applicant: SCHEIDER Laser Technologies AGInventors: Holger Zellmer, Andreas Tuennermann
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Publication number: 20010017868Abstract: An arrangement which generates red, green and blue laser radiation comprise a laser radiation source whose first beam (&lgr;l) is split in the infrared wavelength range, wherein the first part of this beam is frequency-doubled and green light (&lgr;G) results and another part is used to generate light of the primary colors red (&lgr;R) and blue (&lgr;B). Another part of the first beam (&lgr;l) is fed to a wavelength converter which generates another beam (&lgr;2, &lgr;4) in the infrared wavelength range which has a greater wavelength than the first beam (&lgr;l), further, the colors red (&lgr;R) and blue (&lgr;B) result from the further beam (&lgr;2, &lgr;4) or from a part thereof by another nonlinear process by sum frequency mixing or by frequency doubling or by sum frequency mixing and frequency doubling.Type: ApplicationFiled: February 23, 2001Publication date: August 30, 2001Applicant: SCHNEIDER Laser technologies AG;Inventors: Juergen Kraenert, Thomas Gabler, Holger Zellmer, Andreas Tuennermann
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Publication number: 20010017867Abstract: A fiber amplifier is disclosed comprising a signal source (oscillator), an amplifier fiber and a pump laser. The amplifier fiber is arranged between two polarizers and a portion of the beam that is depolarized in the amplifier fiber is coupled out at the amplifier output, returned to the amplifier input, coupled into the amplifier fiber with the radiation from the signal source and amplified again, and another portion, as linearly polarized beam, exits the fiber amplifier as useful beam.Type: ApplicationFiled: February 27, 2001Publication date: August 30, 2001Applicant: SCHNEIDER Laser Technologies AGInventors: Juergen Kraenert, Thomas Gabler, Holger Zellmer, Andreas Tuennermann
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Publication number: 20010014107Abstract: A directly modulatable laser comprising an active medium inside a laser cavity formed by a resonator mirror and an out-coupling mirror, and a pump light source exciting the active medium. It is characterized in that the active medium generates radiation of two wavelengths (&lgr;1 and &lgr;2) and the resonator mirror is constructed as a controllable reflector by which the reflectivity is controllable for each of the two wavelengths (&lgr;1 and &lgr;2) and the controllable reflector is connected with a control unit, wherein the reflection factor is controlled in such a way that the inversion density of the electrons which is generated in the active medium is constant and the light output of one of the wavelengths ((&lgr;1) is controllable between a minimum value and a maximum value according to an applied control signal, wherein the control of the two wavelengths ((&lgr;1 and &lgr;2) is carried out in push-pull.Type: ApplicationFiled: February 9, 2001Publication date: August 16, 2001Applicant: SCHNEIDER Laser Technologie AG;Inventors: Andreas Tuennermann, Holger Zellmer, Jens-Peter Ruske