Patents by Inventor Jens Limpert

Jens Limpert 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).

  • Publication number: 20210223183
    Abstract: An exemplary laser microscope can be provided, comprising at least one first laser source which emits at least one (e.g., pulsed) excitation beam, a scanning optical configuration (e.g., configured to scan the excitation beam over the surface of a sample), a focusing optical configuration (e.g., configured to focus the excitation beam onto the sample), and at least one detector configured to detect light emitted by the sample due to an optical effect in response to the excitation beam. A second laser source facilitates a pulsed ablation beam for a local ablation of the material of the sample. The ablation beam can be guided to the sample via the scanning and focusing optical configurations, The first and second laser sources can be fed by a mutual continuous wave pump laser- and/or a mutual pulsed pump laser. The first laser source can emit pulses with at least two different wavelengths.
    Type: Application
    Filed: May 19, 2017
    Publication date: July 22, 2021
    Inventors: Jürgen POPP, Micheal SCHMITT, Tobias MEYER, Stefan NOLTE, Roland ACKERMANN, Jens LIMPERT
  • Publication number: 20210191230
    Abstract: The invention relates to a device (1) for generating laser pulses, comprising a pump laser (1), which emits laser pulses at a pump wavelength (12) with a repetition frequency, wherein the pulse duration of the laser pulses is 0.5-100 ps, and an optical parametric oscillator (3) that converts the laser pulses of the pump laser (1) at least partially to laser pulses at a signal wavelength (10) and at an idler wavelength (11), which differs from the former, wherein the optical parametric oscillator (3) has an optical resonator (20), comprising a non-linear wavelength converter (22), which converts the laser pulses of the pump laser (1) to laser pulses at the signal wavelength (10) and at the idler wavelength (11), and an output coupling element (24), which couples at least some of the radiation out of the optical resonator (20).
    Type: Application
    Filed: February 1, 2017
    Publication date: June 24, 2021
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Thomas Gottschall, Jens Limpert, Andreas Tunnermann
  • Patent number: 11043783
    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: Grant
    Filed: December 20, 2016
    Date of Patent: June 22, 2021
    Assignees: Fraunhoer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Michael Müller, Marco Kienel, Arno Klenke, Jens Limpert, Andreas Tünnermann
  • Publication number: 20210091527
    Abstract: The invention relates to an apparatus for generating laser pulses. It is an object of the invention to provide a method for generating synchronized laser pulse trains at variable wavelengths (e.g., for coherent Raman spectroscopy/microscopy), wherein the switching time for switching between different wavelengths should be in the sub-?s range. For this purpose the apparatus according to the invention comprises a pump laser (1), which emits pulsed laser radiation at a specified wavelength, an FDML laser (3), which emits continuous wave laser radiation at a cyclically variable wavelength, and a nonlinear conversion medium (4), in which the pulsed laser radiation of the pump laser (1) and the continuous wave laser radiation of the FDML laser (3) are superposed.
    Type: Application
    Filed: July 12, 2018
    Publication date: March 25, 2021
    Applicants: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V., Friedrich-Schiller-Universitat Jena, Leibniz-lnstitut Für Photonische Technologien E.V.
    Inventors: Thomas GOTTSCHALL, Jens LIMPERT, Andreas TÜNNERMANN, Tobias MEYER, Jürgen POPP
  • Patent number: 10784643
    Abstract: A method for generating a laser pulse train is provided, including at least the following method steps: generating a laser pulse train at a pulse repetition frequency; coupling the laser pulse train into an acousto-optical modulator, and selecting individual laser pulses of the laser pulse train. A system for generating a laser pulse train is also provided, including at least a pulsed laser and an acousto-optical modulator, and an associated control device.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: September 22, 2020
    Assignee: Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V.
    Inventors: Oliver De Vries, Jens Limpert, Marco Plotner
  • Publication number: 20200153190
    Abstract: The invention relates to a method for stably transmitting laser radiation through an optical waveguide (3), wherein two or more modes of the laser radiation propagating in the optical waveguide (3) interfere and form a mode interference pattern in the optical waveguide, as a result of which a thermally induced refractive index grating is produced in the optical waveguide (3). It is an object of the invention to demonstrate an effective approach for stabilizing the output signal of the optical waveguide (3) in a fiber-based laser/amplifier combination at high output powers, i.e. for avoiding mode instability. The invention achieves this object by virtue of the fact that a relative spatial phase shift between the mode interference pattern and the thermally induced refractive index grating is set in the direction of propagation of the laser radiation.
    Type: Application
    Filed: July 17, 2018
    Publication date: May 14, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V., Friedrich-Schiller-Universität Jena
    Inventors: Christoph STIHLER, César JÁUREGUI MISAS, Jens LIMPERT, Andreas TÜNNERMANN
  • Patent number: 10490969
    Abstract: A method of propagating a laser signal through an optical waveguide and a waveguide laser system provide a novel way of stabilizing the beam emitted by a fiber laser system above the mode instability threshold wherein the beat length of two or more interfering transverse modes of the laser signal in the optical waveguide is modulated in time.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: November 26, 2019
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V., Friedrich-Schiller-Universitaet Jena
    Inventors: Christoph Stihler, César Jáuregui Misas, Jens Limpert, Hans-Juergen Otto, Andreas Tuennermann, Fabian Stutzki
  • 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: 20180041001
    Abstract: The invention relates to a method for generating a laser pulse train, comprising the following method steps: generating the laser pulse train (4a) at a pulse repetition frequency; coupling the laser pulse train (4a) into an acousto-optical modulator, and selecting individual laser pulses of the laser pulse train (4a) by driving the acousto-optical modulator with high-frequency pulses (4h), wherein the high-frequency pulses (4h) are generated by modulating a high-frequency carrier signal (4f) with a periodic switching signal (4e). In addition, the invention relates to a system for generating a laser pulse train, comprising a pulsed laser (1), which generates the laser pulse train at a pulse repetition frequency, and an acousto-optical modulator (2), in which the laser pulses propagate, and comprising a control device (7), which drives the acousto-optical modulator (2) with high-frequency pulses for the purpose of selecting individual laser pulses.
    Type: Application
    Filed: March 2, 2016
    Publication date: February 8, 2018
    Applicant: Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V.
    Inventors: Oliver De Vries, Jens Limpert, Marco Plotner
  • 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: 20180019566
    Abstract: A method of propagating a laser signal through an optical waveguide and a waveguide laser system provide a novel way of stabilizing the beam emitted by a fiber laser system above the mode instability threshold wherein the beat length of two or more interfering transverse modes of the laser signal in the optical waveguide is modulated in time.
    Type: Application
    Filed: July 14, 2017
    Publication date: January 18, 2018
    Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V., Friedrich-Schiller-Universitaet Jena
    Inventors: Christoph STIHLER, César JÁUREGUI MISAS, Jens LIMPERT, Hans-Juergen OTTO, Andreas TUENNERMANN, Fabian STUTZKI
  • 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: 9484709
    Abstract: 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: Grant
    Filed: August 29, 2011
    Date of Patent: November 1, 2016
    Assignees: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V., FRIEDRICH-SCHILLER-UNIVERSITAET JENA
    Inventors: Arno Klenke, Enrico Seise, Jens Limpert, Andreas Tuennermann
  • Patent number: 9459403
    Abstract: The invention relates to an apparatus for generating azimuthally or radially polarized radiation by means of an optical waveguide (1), wherein the optical waveguide (1) has a structure which is suitable for conducting azimuthally or radially polarized modes (5, 7). The invention proposes that the azimuthally or radially polarized modes (5, 7) in the optical waveguide (1) have different effective refractive indices and, within the optical waveguide (1), a narrow-band grating (2) is arranged, in particular a fiber Bragg grating (2) which is designed such that the spectral distance between two azimuthally or radially polarized resonant modes (5, 7) is equal to or greater than the associated spectral bandwidth.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: October 4, 2016
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Friedrich-Schiller-Universitaet Jena
    Inventors: Andreas Tuennermann, Christoph Jocher, César Jauregui Misas, Jens Limpert