Patents by Inventor Stefan Spiekermann
Stefan Spiekermann 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: 20240110056Abstract: The present disclosure provides a two-part curable composition precursor comprising (a) a first part (A) comprising at least one multifunctional epoxy resin having an epoxy functionality of at least three; and (b) a second part (B) comprising a prepolymer obtained from (i) a first amine-based epoxy curing agent and a second amine-based epoxy curing agent distinct from the first amine-based epoxy curing agent and (ii) at least one epoxy resin.Type: ApplicationFiled: December 21, 2021Publication date: April 4, 2024Inventors: Sohaib ELGIMIABI, Stefan SPIEKERMANN, Florian SZILLAT
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Publication number: 20230216272Abstract: The invention relates to a method for generating a laser pulse, wherein during the method a first semi-conductor laser in the form of a broadband laser diode is used to generate a pump laser pulse, the pump laser pulse is used to pump a second semi-conductor laser, the laser pulse being shorter than the pump laser pulse and the second semi-conductor laser comprising at least 20 quantum wells arranged above one another in the emission direction of the laser pulse.Type: ApplicationFiled: June 8, 2021Publication date: July 6, 2023Inventor: Stefan SPIEKERMANN
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Patent number: 9570882Abstract: In a master oscillator plus power amplifier (MOPA) system, the oscillator is a passively Q-switched laser. The laser is triggered into passively Q-switched operation by operating an optical switch to resonantly couple back into the laser amplified stimulated emission generated by the amplifier.Type: GrantFiled: March 27, 2013Date of Patent: February 14, 2017Assignee: Coherent LaserSystems GmbH & Co. KGInventor: Stefan Spiekermann
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Patent number: 9304337Abstract: A Faraday rotator includes two magnet sub-assemblies assemblies spaced apart and aligned with each other with a gap therebetween. Each magnet sub-assembly includes a central magnet magnetized in direction parallel to the gap. The central magnet is sandwiched between two end magnets magnetized in a direction perpendicular to the gap. A magneto-optic crystal is located in the gap between the central magnets.Type: GrantFiled: January 13, 2014Date of Patent: April 5, 2016Assignee: COHERENT LASERSYSTEMS GMBHInventors: Peter Ebenwalder, Sebastian Koke, Stefan Spiekermann
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Publication number: 20150198823Abstract: A Faraday rotator includes two magnet sub-assemblies assemblies spaced apart and aligned with each other with a gap therebetween. Each magnet sub-assembly includes a central magnet magnetized in direction parallel to the gap. The central magnet is sandwiched between two end magnets magnetized in a direction perpendicular to the gap. A magneto-optic crystal is located in the gap between the central magnets.Type: ApplicationFiled: January 13, 2014Publication date: July 16, 2015Applicant: COHERENT LASERSYSTEMS GMBH & CO. KGInventors: Peter EBENWALDER, Sebastian KOKE, Stefan SPIEKERMANN
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Publication number: 20150103854Abstract: A microcrystal laser assembly including a gain-crystal includes a frame having a high thermal conductivity. The frame has a base with two spaced apart portions extending from the base. The gain-crystal has a resonator output mirror on one surface thereof. The gain-crystal is supported on the spaced-apart portions of the frame in the space therebetween. Another resonator minor is supported in that space, spaced apart from the output mirror, on a pedestal attached to the base of the frame. The pedestal and the frame have different CTE. Varying the frame temperature varies the spacing between the resonator mirrors depending on the CTE difference between the pedestal and the frame.Type: ApplicationFiled: December 19, 2014Publication date: April 16, 2015Inventor: Stefan SPIEKERMANN
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Patent number: 8964800Abstract: A microcrystal laser for generating laser pulses has a laser resonator which has a laser medium arranged between two mirrors; and an arrangement for stabilizing the optical path length is provided. The laser resonator has a saturable absorber medium for pulse generation.Type: GrantFiled: February 20, 2014Date of Patent: February 24, 2015Assignee: Coherent LaserSystems GmbH & Co. KGInventors: Stefan Spiekermann, Georg Sommerer
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Patent number: 8948220Abstract: A microcrystal laser assembly including a gain-crystal includes a frame having a high thermal conductivity. The frame has a base with two spaced apart portions extending from the base. The gain-crystal has a resonator output minor on one surface thereof. The gain-crystal is supported on the spaced-apart portions of the frame in the space therebetween. Another resonator minor is supported in that space, spaced apart from the output mirror, on a pedestal attached to the base of the frame. The pedestal and the frame have different CTE. Varying the frame temperature varies the spacing between the resonator minors depending on the CTE difference between the pedestal and the frame.Type: GrantFiled: December 18, 2012Date of Patent: February 3, 2015Assignee: Coherent GmbHInventor: Stefan Spiekermann
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Publication number: 20140301422Abstract: A microcrystal laser for generating laser pulses has a laser resonator which has a laser medium arranged between two mirrors; and an arrangement for stabilizing the optical path length is provided. The laser resonator has a saturable absorber medium for pulse generation.Type: ApplicationFiled: February 20, 2014Publication date: October 9, 2014Applicant: COHERENT LASERSYSTEMS GMBH & CO. KGInventors: Stefan SPIEKERMANN, Georg SOMMERER
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Patent number: 8848751Abstract: A master oscillator power amplifier (MOPA) system includes an oscillator having a neodymium-doped gadolinium vanadate gain-medium and delivering seed-pulses. A length of single mode fiber is used to broaden the spectrum of the seed pulse. An amplifier having a neodymium-doped yttrium vanadate gain-medium amplifies the spectrally broadened seed-pulses. The gain-spectrum of the amplifier partially overlaps the broadened pulse-spectrum, providing spectral selection of the seed-pulses in addition to amplification. This provides amplified output-pulses having a duration about one-third that of the corresponding seed-pulses.Type: GrantFiled: February 27, 2013Date of Patent: September 30, 2014Assignee: Coherent GmbHInventor: Stefan Spiekermann
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Patent number: 8837535Abstract: A microcrystal laser for generating laser pulses has a laser resonator which has a laser medium arranged between two mirrors; and an arrangement for stabilizing the optical path length is provided. The laser resonator has a saturable absorber medium for pulse generation.Type: GrantFiled: March 29, 2011Date of Patent: September 16, 2014Assignee: Coherent Lasersystems GmbH & Co. KGInventors: Stefan Spiekermann, Georg Sommerer
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Publication number: 20140241386Abstract: A master oscillator power amplifier (MOPA) system includes an oscillator having a neodymium-doped gadolinium vanadate gain-medium and delivering seed-pulses. A length of single mode fiber is used to broaden the spectrum of the seed pulse. An amplifier having a neodymium-doped yttrium vanadate gain-medium amplifies the spectrally broadened seed-pulses. The gain-spectrum of the amplifier partially overlaps the broadened pulse-spectrum, providing spectral selection of the seed-pulses in addition to amplification. This provides amplified output-pulses having a duration about one-third that of the corresponding seed-pulses.Type: ApplicationFiled: February 27, 2013Publication date: August 28, 2014Applicant: COHERENT GMBHInventor: Stefan SPIEKERMANN
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Publication number: 20140169390Abstract: A microcrystal laser assembly including a gain-crystal includes a frame having a high thermal conductivity. The frame has a base with two spaced apart portions extending from the base. The gain-crystal has a resonator output minor on one surface thereof. The gain-crystal is supported on the spaced-apart portions of the frame in the space therebetween. Another resonator minor is supported in that space, spaced apart from the output mirror, on a pedestal attached to the base of the frame. The pedestal and the frame have different CTE. Varying the frame temperature varies the spacing between the resonator minors depending on the CTE difference between the pedestal and the frame.Type: ApplicationFiled: December 18, 2012Publication date: June 19, 2014Applicant: COHERENT GMBHInventor: Stefan SPIEKERMANN
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Publication number: 20110243158Abstract: A microcrystal laser for generating laser pulses has a laser resonator which has a laser medium arranged between two mirrors; and an arrangement for stabilizing the optical path length is provided. The laser resonator has a saturable absorber medium for pulse generation.Type: ApplicationFiled: March 29, 2011Publication date: October 6, 2011Applicant: InnoLight Innovative Laser und Systemtechnik GmbHInventors: Stefan Spiekermann, Georg Sommerer
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Patent number: 7651580Abstract: The invention relates to nanoparticulate preparations containing at least one mixed metal oxide in the form of supramagnetic, nanoscale particles, methods for heating such a preparation, and methods for producing and dissolving adhesive compounds on the basis of said preparations.Type: GrantFiled: December 15, 2008Date of Patent: January 26, 2010Assignee: Henkel Kommanditgesellschaft Auf Aktien (Henkel KGAA)Inventors: Hans-Martin Sauer, Elisabeth Cura, Sohaib Elgimiabi, Rolf Hempelmann, Frank Meyer, Stefan Spiekermann
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Patent number: 7551653Abstract: A laser arrangement comprising a first and a second resonant cavity for generating a first and a second fundamental wavelength. A first and a second non-linear region are provided in the second cavity for sum-frequency mixing of the radiation generated in the first cavity and in the second cavity, and for frequency-doubling of the radiation generated in the second cavity, respectively.Type: GrantFiled: December 17, 2004Date of Patent: June 23, 2009Assignee: Cobolt ABInventors: Stefan Spiekermann, Håkan Karlsson, Jenni Nordborg
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Publication number: 20090133822Abstract: The invention relates to nanoparticulate preparations containing at least one mixed metal oxide in the form of supramagnetic, nanoscale particles, methods for heating such a preparation, and methods for producing and dissolving adhesive compounds on the basis of said preparations.Type: ApplicationFiled: December 15, 2008Publication date: May 28, 2009Applicant: Henkel Kommanditgesellschaft auf Akitien (Henkel KGaA)Inventors: Hans-Martin Sauer, Elisabeth Cura, Sohaib Elgimiabi, Rolf Hempelmann, Frank Meyer, Stefan Spiekermann
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Patent number: 7479288Abstract: The invention relates to nanoparticulate preparations containing at least one mixed metal oxide in the form of supramagnetic, nanoscale particles, methods for heating such a preparation, and methods for producing and dissolving adhesive compounds of the basis of said preparations.Type: GrantFiled: June 21, 2004Date of Patent: January 20, 2009Assignee: Henkel Kommanditgesellschaft Auf AktienInventors: Hans-Martin Sauer, Elisabeth Cura, Sohaib Elgimiabi, Rolf Hempelmann, Frank Meyer, Stefan Spiekermann
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Publication number: 20080308222Abstract: The invention relates to nanoparticulate preparations containing at least one mixed metal oxide in the form of supramagnetic, nanoscale particles, methods for heating such a preparation, and methods for producing and dissolving adhesive compounds on the basis of said preparations.Type: ApplicationFiled: June 21, 2004Publication date: December 18, 2008Inventors: Hans-Martin Sauer, Elisabeth Cura, Sohaib Elgimiabi, Rolf Hempelmann, Frank Meyer, Stefan Spiekermann
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Patent number: 7362783Abstract: A method of generating coherent radiation, wherein a first fundamental beam of radiation from a four level laser and a second fundamental beam of radiation from a three level laser are mixed in a non-linear body to obtain an output beam at the sum frequency of the two fundamental beams. The invention also relates to an arrangement for carrying out the method.Type: GrantFiled: June 13, 2002Date of Patent: April 22, 2008Assignee: Cobolt ABInventors: Stefan Spiekermann, Katrin Ekvall, Håkan Karlsson