Patents by Inventor Poul Varming
Poul Varming 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: 20240106198Abstract: A laser device includes a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: ApplicationFiled: May 31, 2023Publication date: March 28, 2024Applicant: NKT PHOTONICS A/SInventors: Jens E. PEDERSEN, Poul VARMING, Christian V. POULSEN, Thomas O. FAGERHØJ, Bjarke GØTH, Henrik SØRENSEN
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Patent number: 11699891Abstract: A laser device includes a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: GrantFiled: September 20, 2021Date of Patent: July 11, 2023Assignee: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhoj, Bjarke Goth, Henrik Sorensen
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Publication number: 20220006261Abstract: A laser device includes a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: ApplicationFiled: September 20, 2021Publication date: January 6, 2022Applicant: NKT PHOTONICS A/SInventors: Jens E. PEDERSEN, Poul VARMING, Christian V. POULSEN, Thomas O. FAGERHOJ, Bjarke GOTH, Henrik SORENSEN
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Patent number: 11152761Abstract: A laser device includes a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: GrantFiled: May 24, 2019Date of Patent: October 19, 2021Assignee: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhøj, Bjarke Gøth, Henrik Sørensen
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Publication number: 20190334314Abstract: A laser device includes a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: ApplicationFiled: May 24, 2019Publication date: October 31, 2019Applicant: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhøj, Bjarke Gøth, Henrik Sørensen
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Patent number: 10340657Abstract: A laser device includes a tunable laser having a laser cavity and a laser control module placed outside the laser cavity, the tunable laser being configured to generate laser light having a center frequency, the laser control module being configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes an interferometer having interferometer mirrors and a tunable interferometer length, and wherein the interferometer length is tunable by an actuator arranged between the interferometer mirrors and by thermal variation.Type: GrantFiled: May 23, 2017Date of Patent: July 2, 2019Assignee: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhøj, Bjarke Gøth, Henrik Sørensen
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Publication number: 20170324216Abstract: A laser device includes a tunable laser having a laser cavity and a laser control module placed outside the laser cavity, the tunable laser being configured to generate laser light having a center frequency, the laser control module being configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module includes an interferometer having interferometer mirrors and a tunable interferometer length, and wherein the interferometer length is tunable by an actuator arranged between the interferometer mirrors and by thermal variation.Type: ApplicationFiled: May 23, 2017Publication date: November 9, 2017Applicant: NKT PHOTONICS A/SInventors: Jens E. PEDERSEN, Poul VARMING, Christian V. POULSEN, Thomas O. FAGERHØJ, Bjarke GØTH, Henrik SØRENSEN
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Patent number: 9667033Abstract: The invention relates to a laser device, comprising a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module comprises a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: GrantFiled: February 8, 2013Date of Patent: May 30, 2017Assignee: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhøj, Bjarke Gøth, Henrik Sørensen
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Publication number: 20150029515Abstract: The invention relates to a laser device, comprising a laser configured to generate laser light and a laser control module configured to receive at least a portion of the laser light generated by the laser, to generate a control signal and to feed the control signal back to the laser for stabilizing the frequency, wherein the laser control module comprises a tunable frequency discriminating element which is preferably continuously frequency tunable, and where the laser control module is placed outside the laser cavity.Type: ApplicationFiled: February 8, 2013Publication date: January 29, 2015Applicant: NKT PHOTONICS A/SInventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas P. Fagerhøj, Bjarke Gøth, Henrik Sørensen
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Patent number: 7792408Abstract: Refractive index modifications such as e.g. Fiber Bragg gratings in micro-structured Fiber are according to an aspect of the invention fabricated by first filling and/or purging the holes of the micro-structured fiber with inert gas or by evacuation and, optionally subsequently scaling the ends. Alternatively, the ends of the micro-structured fiber may be sealed without a preceding purging or evacuation of the holes. In this way hydrogen or deuterium present in the holes after photosensitizing loading will not react with atmospheric oxygen to form water. Water formed this way would otherwise seriously impair the grating formation process. Bragg gratings and other refractive index structures can thus be fabricated with high quality and predictable specifications in micro-structured fiber. Sealing the fiber ends also prevents in-diffusion of moisture. The invention may e.g. find application in connection with fiber optical sensors, high-power fiber lasers, etc.Type: GrantFiled: August 24, 2005Date of Patent: September 7, 2010Assignee: NKT Photonics A/SInventor: Poul Varming
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Publication number: 20090238215Abstract: Refractive index modifications such as e.g. Fiber Bragg gratings in micro-structured Fiber are according to an aspect of the invention fabricated by first filling and/or purging the holes of the micro-structured fiber with inert gas or by evacuation and, optionally subsequently scaling the ends. Alternatively, the ends of the micro-structured fiber may be sealed without a preceding purging or evacuation of the holes. In this way hydrogen or deuterium present in the holes after photosensitizing loading will not react with atmospheric oxygen to form water. Water formed this way would otherwise seriously impair the grating formation process. Bragg gratings and other refractive index structures can thus be fabricated with high quality and predictable specifications in micro-structured fiber. Sealing the fiber ends also prevents in-diffusion of moisture. The invention may e.g. find application in connection with fiber optical sensors, high-power fiber lasers, etc.Type: ApplicationFiled: August 24, 2005Publication date: September 24, 2009Applicant: KOHERAS A/SInventor: Poul Varming
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Publication number: 20070263676Abstract: The invention relates to a system comprising a waveguide laser for exciting laser light at a lasing wavelength ?s and a pump for pumping the waveguide laser at a pumping wavelength ?p. The invention further relates to a method of providing such a system and its use. The object of the present invention is to provide a system comprising a waveguide laser with a reduced phase noise. The problem is solved in that the pump is a single frequency laser. The invention may e.g. be used in systems where an ultra-low phase noise and/or linewidth is required, e.g. in LIDAR or interferometric systems.Type: ApplicationFiled: June 21, 2005Publication date: November 15, 2007Applicant: KOHERAS A/SInventors: Martijn Beukema, Christian Poulsen, Jens Pedersen, Poul Varming
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Publication number: 20070153839Abstract: The invention relates to an optical waveguide laser comprising a) an active region formed over a length of the optical waveguide, comprising an excitable material emitting light in response to stimulation by pump light thereby defining an optical gain profile and the excitable material comprises Tm; b) a frequency discriminated feedback element adapted to select a single longitudinal lasing mode by coordination with the frequency response of the optical gain of the excitable material; and c) a polarisation asymmetry element adapted for selecting a single polarisation mode of a given longitudinal mode by selectively suppressing propagation of the other polarisation mode of said longitudinal mode. The object of the present invention is to provide relatively simple, compact and economic lasers for single-frequency operation in the wavelength range of 1.7 um to 2.2 um; in particular for a number of applications, including spectroscopy and for eye-safe optical sources in sensing and in LIDAR, etc.Type: ApplicationFiled: December 13, 2004Publication date: July 5, 2007Applicant: KOHERAS A/SInventors: Poul Varming, Soren Agger
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Patent number: 6151429Abstract: A method of producing an active optical waveguide having asymmetric polarization, said method comprising the steps of (a) providing an active optical waveguide (10) comprising: (i) a transverse refractive index profile (21) comprising a guiding region (11), an intermediate region (13), and a non-guiding region (12); (ii) a transverse photorefractive dopant profile (31) comprising a constant or graded photorefractive dopant concentration within at least one of the guiding, non-guiding and intermediate regions, except that the photorefractive dopant is not located solely in the guiding region; and (iii) exhibiting in said guiding region, intermediate region, or both, light guiding modes having different polarizations; and (b) exposing at least a part (10a, 10b) of the active optical waveguide to an effective transverse illumination of light (20) reacting with the photorefractive dopant and modifying said transverse refractive index profile; said part of the active optical waveguide being exposed to a fluence seType: GrantFiled: July 30, 1999Date of Patent: November 21, 2000Assignees: Ionas A/A, Lucent Tech, DenmarkInventors: Martin Kristensen, Jorg Hubner, Poul Varming, Milan Sejka, Bera Palsdottir