Patents Assigned to FRIEDRICH-SCHILLER-UNIVERSITAT JENA
  • 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
  • Publication number: 20210047719
    Abstract: A method for producing an aluminum layer is provided. The method includes depositing a metallic seed layer on a substrate, the seed layer having a thickness of not more than 5 nm, and also includes applying the aluminum layer to the seed layer, wherein the aluminum layer has a thickness of more than 30 nm. Further, an optical element, which can be a mirror layer, is provided including the metallic seed layer and the aluminum layer.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 18, 2021
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V., Friedrich-Schiller-Universität Jena
    Inventors: Sven Stempfhuber, Dieter Gäbler, Paul Schenk, Peter Munzert, Stefan Schwinde
  • Publication number: 20200412076
    Abstract: The invention relates to a device for generating a sequence of laser pulses consisting of pulse bursts. The object of the invention is to provide a possibility of generating laser pulses for material processing in the burst mode at a high quality based on the principle of beam combination.
    Type: Application
    Filed: September 4, 2018
    Publication date: December 31, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Klaus Bergner, Stefan Nolte, Martin Gebhardt
  • Publication number: 20200398374
    Abstract: The invention concerns a method and an apparatus for processing an object (1) by means of interfering laser beams. It is the task of the invention to provide for an improved compensation of the aberrations accumulated over the beam path in such processes/apparatuses, since these are a substantial disturbing factor with respect to the precision in structuring the material. Furthermore, the influence of the period course, i.e. the spatial modulation of the period of the modification produced in the material of the object (1), shall be improved. The invention proposes that laser radiation is generated as a collimated laser beam (3). The intensity distribution and/or the phase progression is influenced over the cross-section of the laser beam (3) to correct aberrations. The laser beam (3) is divided into two partial beams (6, 7). Finally, the partial beams (6, 7) are deflected and focused so that the partial beams (6, 7) overlap in a processing zone (10) in the material of the object (1).
    Type: Application
    Filed: March 7, 2019
    Publication date: December 24, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V., Friedrich-Schiller-Universität Jena
    Inventors: Malte Per SIEMS, Stefan NOLTE, Daniel RICHTER, Ria KRÄMER, Thorsten Albert GOEBEL
  • Publication number: 20200333611
    Abstract: The invention relates to an arrangement for producing a Bessel beam (5), comprising a beam-forming element (2), which transforms a beam (1) incident as a plane electromagnetic wave into a Bessel beam (5). According to the invention, the beam-forming element (2) comprises at least one annular lens (3, 3?) and a Fourier optical unit, e.g. in the form of a Fourier lens (4).
    Type: Application
    Filed: June 22, 2017
    Publication date: October 22, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Ralf Steinkopf, Stefan Nolte, Christian Vetter, Alexander Szameit, Herbert Gross, Marco Ornigotti
  • Patent number: 10769782
    Abstract: Exemplary method, computer-accessible medium and system can be provided for determining the presence or absence of a local and/or global property of a biological tissue sample. Thus, it is possible to obtain at least one image of the sample, search the image(s) for a presence of at least one particular feature that is contained in a pre-defined set of features, and assign, to the particular feature(s). It is possible to compute, with a computer processor, at least one discriminant value that is a function of the pronunciation index that is weighted with a particular weight. The weight of each pronunciation index is a measure for a relevance of the corresponding feature with respect to the property. It is possible to determine whether the property is present in at least one part of the biological tissue sample depending on whether the discriminant value exceeds a pre-defined threshold and/or and optimized threshold.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: September 8, 2020
    Assignees: Leibniz-Institut für Photonische Technologien e.V., Friedrich-Schiller-Universität Jena
    Inventors: Jürgen Popp, Thomas Bocklitz, Olga Chernavskaia, Tobias Meyer
  • Publication number: 20200206841
    Abstract: The invention relates to a method for machining a transparent workpiece (4) by generating non-linear absorption of laser radiation in a laser beam focus located in a volume of the workpiece (4). The object of the invention is that of providing a method of improved precision and quality, and a corresponding device, for laser machining of workpieces. In particular, it is also intended for it to be possible for workpieces made of composite materials or of other special materials, such as filter glass, to be machined at an improved level of quality. For this purpose, the method according to the invention comprises the following steps: spectroscopic measurement of the linear absorption of the laser radiation in the workpiece (4), selecting a working wavelength at which the linear absorption is low, and machining the workpiece (4) by means of application of laser radiation at the working wavelength. The invention furthermore relates to a corresponding device for machining a transparent workpiece (4).
    Type: Application
    Filed: September 3, 2018
    Publication date: July 2, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Klaus Bergner, Stefan Nolte
  • 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: 10494357
    Abstract: The present invention relates to compounds of formula (III) or to compounds of formula (IV) wherein R1, R2, R3 and R4 are as defined in the claims, and their use in therapeutic treatments of 5-lipoxygenase related diseases such as chronic airway inflammatory or dermatological disorders.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: December 3, 2019
    Assignees: UNIVERSITÉ D'ANGERS, UNIVERSITÄT INNSBRUCK, FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
    Inventors: Pascal Richomme, Jean-Jacques Helesbeux, David Guilet, Denis Seraphin, Hermann Stuppner, Birgit Waltenberger, Daniela Schuster, Veronika Sophie Temml, Andreas Koeberle, Oliver Werz
  • Patent number: 10429549
    Abstract: An optical element including a reflective coating is disclosed. In an embodiment the reflective coating includes an adhesion-promoting layer, an at least partially reflective silver layer disposed on the adhesion-promoting layer and a protective layer system disposed on the silver layer, wherein the protective layer system includes a plurality of dielectric layers, wherein the dielectric layers include at least one first layer and at least one second layer, wherein the first layer and the second layer have a different resistance to at least two different contamination substances, wherein the dielectric layers have a thickness of not more than 30 nm, and wherein a number of the dielectric layers amounts to at least five.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: October 1, 2019
    Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Mark Schürmann, Stefan Schwinde, Norbert Kaiser
  • Publication number: 20190204571
    Abstract: A method and a device for producing an optical component having at least three monolithically arranged optical functional surfaces and an optical component are disclosed.
    Type: Application
    Filed: November 29, 2016
    Publication date: July 4, 2019
    Applicants: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena, Friedrich-Schiller-Universität Jena
    Inventors: Matthias Beier, Johannes Hartung, Christoph Damm, Stefan Risse, Britta Satzer
  • 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
  • Patent number: 10106540
    Abstract: The present invention relates to small molecule compounds and their use as HDAC inhibitors and in the treatment of various diseases, such as cancer. The present invention further relates to methods of synthesizing the compounds and methods of treatment. H-L(HA), H is a head group selected from (head group 1), (head group 2), (head group 3), (head group 4), (head group 5) and (head group 6).
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: October 23, 2018
    Assignees: UNIVERSITÄT REGENSBURG, FRIEDRICH-SCHILLER-UNIVERSITÄT JENA, UNIVERSITÄTSKLINIKUM JENA
    Inventors: Siavosh Mahboobi, Andreas Sellmer, Herwig Pongratz, Michel Leonhardt, Oliver Krämer, Frank-Dietmar Böhmer, Gerhard Kelter
  • Patent number: 10101665
    Abstract: An illumination unit for lithographic exposure and a device for lithographic exposure are disclosed. In an embodiment the illumination unit includes a beam source, an electronically drivable beam deflection element for generating a temporally varying two-dimensional beam deflection, a collimation lens, a beam homogenizing element, a Fourier lens and a field lens.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: October 16, 2018
    Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Uwe Detlef Zeitner, Tina Weichelt, Yannick Bourgin
  • 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
  • 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
  • Patent number: 9815262
    Abstract: The invention relates to a method of joining substrates. It is the object of the invention in this respect to join substrates of substrate materials together without having to exert an increased effort for a coating with additional coating processes to be carried out and to be able to achieve a good quality of the join connection in so doing. In the method in accordance with the invention a pretreatment of at least one join surface of a substrate to be joined is carried out in low pressure oxygen plasma prior to the actual joining. On the joining, a contact force acts on the substrates to be joined in the range 2 kPa to 5 MPa and in this process a heat treatment is carried out at an elevated temperature of at least 100° C. and at under pressure conditions of a maximum of 10 mbar, preferably <10?3 mbar.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: November 14, 2017
    Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Gerhard Kalkowski, Carolin Rothhardt, Mathias Rohde, Ramona Eberhardt
  • 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