Patents by Inventor Andreas Tunnermann

Andreas Tunnermann 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).

  • Patent number: 10340655
    Abstract: The invention relates to an optical waveguide (3) as a laser medium or as a gain medium for high-power operation, wherein the optical waveguide (3) is an optical fiber, the light-guiding core of which, at least in sections, is doped with rare earth ions. It is an object of the invention to provide an optical waveguide as a laser or a gain medium, and a laser/amplifier combination realized therewith, in which the output signal of the laser or gain medium is better stabilized. The invention achieves this object by virtue of the maximum small signal gain of the optical waveguide (1) being up to 60 dB, preferably up to 50 dB, more preferably up to 40 dB, even more preferably up to 30 dB, on account of the concentration of the rare earth ions and/or the distribution thereof in the light-guiding core. Moreover, the invention relates to the use of such an optical waveguide as an amplifier fiber (3) in a laser/amplifier combination.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: July 2, 2019
    Assignees: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., FRIEDRICH-SCHILLER-UNIVERSITÄT
    Inventors: Hans Jurgen Otto, Cesar Jauregui Misas, Jens Limpert, Andreas Tunnermann
  • Patent number: 10281647
    Abstract: The invention relates to an optical waveguide with at least one core region (1) extending along the longitudinal extent of the optical waveguide, and with a first jacket (2) which, viewed in the cross section of the optical waveguide, surrounds the core region (1). The invention further relates to an optical arrangement with such an optical waveguide, and to a method for producing the optical waveguide. The object of the invention is to make available an optical waveguide for high-performance operation, which is improved in relation to the prior art in terms of mode instability. The invention achieves this object by virtue of the fact that the optical waveguide consists of crystalline material at least in the core region (1).
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: May 7, 2019
    Assignees: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V., Friedrich-Schiller-Universitat Jena
    Inventors: Cesar Jauregui Misas, Andreas Tunnermann, Jens Limpert, Christian Gaida
  • Publication number: 20190013637
    Abstract: The invention relates to an optical arrangement having a division element which divides an input beam consisting of a sequence of temporally equidistant light pulses into two spatially separate partial beams, at least one optical element through which at least one of the partial beams propagates, and at least one combination element which spatially superimposes the partial beams in an output beam. It is the object of the present invention to show a method for increasing the pulse energy of light pulses which is improved in comparison with the prior art. The invention solves this problem by virtue of the fact that the combination element superimposes a number of the temporally successive light pulses in a single light pulse in the output beam. The invention also relates to a method for increasing the pulse energy of light pulses.
    Type: Application
    Filed: December 20, 2016
    Publication date: January 10, 2019
    Inventors: Michael MÜLLER, Marco KIENEL, Arno KLENKE, Jens LIMPERT, Andreas TÜNNERMANN
  • Patent number: 9941653
    Abstract: The invention relates to an optical array comprising a splitting element (1) which splits an input beam (E) into at least two partial beams (T1, T2, T3, T4), at least one optical element (V1, V2, V3, V4, MV) through which at least one of the partial beams (T1, T2, T3, T4) propagates, and at least one combining element (4) which spatially superimposes the partial beams (T1, T2, T3, T4) in one output beam (A). The object of the invention is to provide an optical array which is improved over the prior art and which permits effective and simple splitting of the input light beam, in particular a laser beam with pulsed or continuous emission. The invention achieves this object in that the splitting element (1) and/or the combining element (4) each have a partially reflective element (2, 2?) which reflects the radiation of the input beam (E) or of the output beam (A) two or more times, wherein the partially reflective element (2, 2?) has zones (a, b, c, d) of different reflectivity.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: April 10, 2018
    Assignees: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
    Inventors: Arno Klenke, Jens Limpert, Hans-Jurgen Otto, Andreas Tunnermann
  • Publication number: 20180034234
    Abstract: The invention relates to an optical waveguide (3) as a laser medium or as a gain medium for high-power operation, wherein the optical waveguide (3) is an optical fiber, the light-guiding core of which, at least in sections, is doped with rare earth ions. It is an object of the invention to provide an optical waveguide as a laser or a gain medium, and a laser/amplifier combination realized therewith, in which the output signal of the laser or gain medium is better stabilized. The invention achieves this object by virtue of the maximum small signal gain of the optical waveguide (1) being up to 60 dB, preferably up to 50 dB, more preferably up to 40 dB, even more preferably up to 30 dB, on account of the concentration of the rare earth ions and/or the distribution thereof in the light-guiding core. Moreover, the invention relates to the use of such an optical waveguide as an amplifier fiber (3) in a laser/amplifier combination.
    Type: Application
    Filed: February 12, 2015
    Publication date: February 1, 2018
    Applicants: Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V., Friedrich-Schiller-Universität
    Inventors: Hans Jürgen OTTO, César JAUREGUI MISAS, Jens LIMPERT, Andreas TÜNNERMANN
  • Patent number: 9880446
    Abstract: The invention relates to an apparatus (1) for producing short synchronous radiation pulses at different wavelengths, particularly to an optically parametric oscillator, comprising at least one pump radiation source (2), preferably a pump laser, for outputting radiation at a pump wavelength, and a resonator (3) having a wavelength-dependent effective resonator length, wherein the resonator (3) has a non-linear wavelength converter (4) for producing radiation at a first and a second wavelength; a dispersive element (5) having a strong wavelength-dependent delay characteristic; and a coupling-out element (6) for at least partially coupling-out the radiation from the resonator (3). In addition, the invention relates to a method for producing short radiation pulses by means of an apparatus (1), particularly an optically parametric oscillator.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: January 30, 2018
    Assignees: FRIEDRICH-SCHILLER-UNIVERSITAT JENA, FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Thomas Gottschall, Jens Limpert, Andreas Tunnermann, Martin Baumgartl
  • Publication number: 20170302047
    Abstract: The invention relates to an optical waveguide with at least one core region (1) extending along the longitudinal extent of the optical waveguide, and with a first jacket (2) which, viewed in the cross section of the optical waveguide, surrounds the core region (1). The invention further relates to an optical arrangement with such an optical waveguide, and to a method for producing the optical waveguide. The object of the invention is to make available an optical waveguide for high-performance operation, which is improved in relation to the prior art in terms of mode instability. The invention achieves this object by virtue of the fact that the optical waveguide consists of crystalline material at least in the core region (1).
    Type: Application
    Filed: October 1, 2015
    Publication date: October 19, 2017
    Applicants: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V., Friedrich-Schiller-Universitat Jena
    Inventors: Cesar Jauregui Misas, Andreas Tunnermann, Jens Limpert, Christian Gaida
  • Publication number: 20170179666
    Abstract: The invention relates to an optical array comprising a splitting element (1) which splits an input beam (E) into at least two partial beams (T1, T2, T3, T4), at least one optical element (V1, V2, V3, V4, MV) through which at least one of the partial beams (T1, T2, T3, T4) propagates, and at least one combining element (4) which spatially superimposes the partial beams (T1, T2, T3, T4) in one output beam (A). The object of the invention is to provide an optical array which is improved over the prior art and which permits effective and simple splitting of the input light beam, in particular a laser beam with pulsed or continuous emission. The invention achieves this object in that the splitting element (1) and/or the combining element (4) each have a partially reflective element (2, 2?) which reflects the radiation of the input beam (E) or of the output beam (A) two or more times, wherein the partially reflective element (2, 2?) has zones (a, b, c, d) of different reflectivity.
    Type: Application
    Filed: February 3, 2015
    Publication date: June 22, 2017
    Applicants: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V., Friedrich-Schiller-Universitat Jena
    Inventors: Arno Klenke, Jens Limpert, Hans-Jurgen Otto, Andreas Tunnermann
  • Publication number: 20160320687
    Abstract: The invention relates to an apparatus (1) for producing short synchronous radiation pulses at different wavelengths, particularly to an optically parametric oscillator, comprising at least one pump radiation source (2), preferably a pump laser, for outputting radiation at a pump wavelength, and a resonator (3) having a wavelength-dependent effective resonator length, wherein the resonator (3) has a non-linear wavelength converter (4) for producing radiation at a first and a second wavelength; a dispersive element (5) having a strong wavelength-dependent delay characteristic; and a coupling-out element (6) for at least partially coupling-out the radiation from the resonator (3). In addition, the invention relates to a method for producing short radiation pulses by means of an apparatus (1), particularly an optically parametric oscillator.
    Type: Application
    Filed: October 28, 2014
    Publication date: November 3, 2016
    Applicants: Fraunhofer-Gesellschaft zur Forderung der angewand ten Forschung e.V., Friedrich-Schiller-Universitat Jena
    Inventors: Thomas Gottschall, Jens Limpert, Andreas Tunnermann, Martin Baumgartl
  • Patent number: 9235106
    Abstract: The invention relates to a method and corresponding devices for reducing mode instability in an optical waveguide (1), a light signal becoming unstable in the optical waveguide (1) beyond an output power threshold and energy being transformed from a basic mode into higher order modes. The invention proposes a reduction in temperature variation (2) along the optical waveguide (1) and/or a reduction in changes in the optical waveguide (1) that are caused by spatial temperature variation as a result of mode interference.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: January 12, 2016
    Assignees: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG e.V., FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
    Inventors: César Jáuregui Misas, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Tino Eidam, Jens Limpert, Andreas Tünnermann
  • Publication number: 20150063767
    Abstract: The invention relates to a method and corresponding devices for reducing mode instability in an optical waveguide (1), a light signal becoming unstable in the optical waveguide (1) beyond an output power threshold and energy being transformed from a basic mode into higher order modes. The invention proposes a reduction in temperature variation (2) along the optical waveguide (1) and/or a reduction in changes in the optical waveguide (1) that are caused by spatial temperature variation as a result of mode interference.
    Type: Application
    Filed: April 12, 2013
    Publication date: March 5, 2015
    Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG e.V., FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
    Inventors: César Jáuregui Misas, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Tino Eidam, Jens Limpert, Andreas Tünnermann
  • Patent number: 8625644
    Abstract: The invention relates to a Q-switched laser comprised of a pump light source (1), an optical resonator accommodating a laser medium (6), and a passive Q-switch (5). It is the object of the present invention to provide an improved Q-switched laser which is of a simple and compact setup while having the least possible jitter of the repetition time. To achieve this target, the invention proposes that by means of a beam splitter (8) part of the light coupled out of the optical resonator is passed on to an optical delay line (9) and coupled back into the optical resonator upon having passed through the optical delay line (9).
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: January 7, 2014
    Assignees: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V., Friedrich-Schiller-Universitat Jena
    Inventors: Andreas Tünnermann, Dirk Nodop, Alexander Steinmetz, Jens Limpert
  • Publication number: 20120242973
    Abstract: The invention relates to a Q-switched laser comprised of a pump light source (1), an optical resonator accommodating a laser medium (6), and a passive Q-switch (5). It is the object of the present invention to provide an improved Q-switched laser which is of a simple and compact setup while having the least possible jitter of the repetition time. To achieve this target, the invention proposes that by means of a beam splitter (8) part of the light coupled out of the optical resonator is passed on to an optical delay line (9) and coupled back into the optical resonator upon having passed through the optical delay line (9).
    Type: Application
    Filed: September 17, 2010
    Publication date: September 27, 2012
    Inventors: Andreas Tünnermann, Dirk Nodop, Alexander Steinmetz, Jens Limpert
  • Patent number: 8083731
    Abstract: An apparatus for laser processing of a material, in particular the eye cornea, emits on to the material a train (18?) of laser radiation pulses having a pulse duration in the femtosecond range. The pulse train comprises a multiplicity of successive pulse groups, each pulse group comprising at least two laser radiation pulses (20?, 22?). The pulses of a pulse group are directed at substantially the same processing site of the material, but the pulses of successive groups are directed at substantially different processing sites of the material. According to the invention the time interval between successive laser radiation pulses of a pulse group is in the nanosecond range. In particular, the intensity or energy of the pulses within a pulse group is graduated, in such a way that a preceding prepulse (20?) has substantially lower intensity or energy than a following main pulse (22?).
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: December 27, 2011
    Assignees: Wavelight AG, Fraunhofer-Gesellschaft zur Forderung der Angewandten Forshung E.V.
    Inventors: Andreas Tunnermann, Klaus Vogler
  • Publication number: 20110100066
    Abstract: A device for joining and tapering optical components such as fibers includes a retaining device for holding optical components in a processing site, a laser radiation source for emitting a laser beam and beam forming elements for guiding the laser beam to the processing site. At least a first beam forming element is inserted into the beam path of the laser radiation source for producing a radiation having the form of an annulus and a second beam forming element is provided for specifying the angle of incidence of the radiation having the form of an annulus onto the optical components at the processing site.
    Type: Application
    Filed: May 19, 2009
    Publication date: May 5, 2011
    Inventors: Steffen Böhme, Thomas Peschel, Ramona Eberhardt, Andreas Tünnermann, Jens Limpert
  • Publication number: 20090213877
    Abstract: A fiber laser for the production of self-similar pulses contains a pumped source and a linear resonator. The linear resonator has two reflectors. The laser further includes a polarization-maintaining fiber doped with an amplifying medium with a normal dispersion ?2>0 in the frequency range prescribed by the amplifying medium and a dispersion-compensating element with an anomalous dispersion ?2<0. The laser further includes an element for decoupling radiation and a non-linear mode coupling element with a modulation depth >0. The fiber, dispersion-compensating element, element for decoupling radiation and non-linear mode coupling element are disposed between the two reflectors in a common beam path delimited by the resonators. The total dispersion of the components disposed in the beam path of the resonator is normal.
    Type: Application
    Filed: August 29, 2006
    Publication date: August 27, 2009
    Inventors: Andreas Tunnermann, Jens Limpert, Bulend Ortac, Thomas Schreiber, Carsten K. Nielsen
  • Publication number: 20080015662
    Abstract: Apparatus and method for laser treatment of a biological material An apparatus for laser processing of a material, in particular the eye cornea, emits on to the material a train (18?) of laser radiation pulses having a pulse duration in the femtosecond range. The pulse train comprises a multiplicity of successive pulse groups, each pulse group comprising at least two laser radiation pulses (20?, 22?). The pulses of a pulse group are directed at substantially the same processing site of the material, but the pulses of successive groups are directed at substantially different processing sites of the material. According to the invention the time interval between successive laser radiation pulses of a pulse group is in the nanosecond range. In particular, the intensity or energy of the pulses within a pulse group is graduated, in such a way that a preceding prepulse (20?) has substantially lower intensity or energy than a following main pulse (22?).
    Type: Application
    Filed: March 2, 2007
    Publication date: January 17, 2008
    Applicant: WAVELIGHT AG
    Inventors: Andreas Tunnermann, Klaus Vogler
  • Patent number: 6002704
    Abstract: A monolithic, non-planar ring laser having Q-switched single-frequency operation comprises a diode laser as the pumping light source of which the pumping light is coupled to a ring laser crystal (2) that comprises at least three total reflection faces B, C and D and a dielectrically coated crystal face A designed as a coupling and decoupling mirror. To obtain high-power laser pulses in the highly stable single-frequency mode and further to achieve compactness, the following design solutions are offered: 1. A switching crystal (20) having an appropriate index of refraction which can be moved to a distance of about one laser beam wavelength to one of the total reflection faces B, C, D of the ring laser crystal (2) to decouple the evanescent wave field and thereby to suppress laser oscillation, said switching crystal being displaceable away from the total reflection face to generate laser pulses, 2.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: December 14, 1999
    Assignee: InnoLight Innovative Laser und Systemtechnik GmbH
    Inventors: Ingo Freitag, Andreas Tunnermann