Patents Assigned to NKT Photonics A/S
  • Publication number: 20220011501
    Abstract: A hollow core photonic crystal fiber (PCF) including an outer cladding region and seven hollow tubes surrounded by the outer cladding region. Each of the hollow tubes is fused to the outer cladding to form a ring defining an inner cladding region and a hollow core region surrounded by the inner cladding region. The hollow tubes are not touching each other, but are arranged with distance to adjacent hollow tubes. The hollow tubes each have an average outer diameter d2 and an average inner diameter d1, wherein d1/d2 is equal to or larger than about 0.8, such as equal to or larger than about 0.85, such as equal to or larger than about 0.9. Also, a laser system.
    Type: Application
    Filed: March 26, 2021
    Publication date: January 13, 2022
    Applicant: NKT Photonics A/S
    Inventors: Jens Kristian LYNGSØE, Christian JAKOBSEN, Mattia MICHIELETTO
  • Patent number: 11221445
    Abstract: The invention relates to a supercontinuum light source comprising a microstructured optical fiber and a pump light source. The microstructured optical fiber comprises a core and a cladding region surrounding the core, as well as a first fiber length section, a second fiber length section and an intermediate fiber length section between said first and second fiber length sections. The first fiber length section comprises a core with a first characteristic core diameter. The second fiber length section comprises a core with a second characteristic core diameter, smaller than said first characteristic core diameter, where said second characteristic core diameter is substantially constant along said second fiber length section. The intermediate length section of the optical fiber comprises a core which is tapered from said first characteristic core diameter to said second characteristic core diameter over a tapered length.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: January 11, 2022
    Assignee: NKT PHOTONICS A/S
    Inventors: Carsten L. Thomsen, Thomas T. Alkeskjold, Erik B. Thomsen
  • Publication number: 20220006261
    Abstract: 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: Application
    Filed: September 20, 2021
    Publication date: January 6, 2022
    Applicant: NKT PHOTONICS A/S
    Inventors: Jens E. PEDERSEN, Poul VARMING, Christian V. POULSEN, Thomas O. FAGERHOJ, Bjarke GOTH, Henrik SORENSEN
  • Publication number: 20210382229
    Abstract: A microstructured optical fiber having a length and a longitudinal axis along its length, the finer including a core region capable of guiding light along the longitudinal axis and a cladding region which surrounds the core region, the cladding region comprising a cladding background material and a plurality of cladding features within the cladding background material, the cladding features being arranged around the core region, wherein the cladding region comprises an inner cladding region comprising an innermost ring of cladding features and an outer cladding region comprises outer cladding rings of outer cladding features, the innermost ring consisting of those cladding features being closest to the core region, wherein the rings of cladding features each comprise bridges of cladding background material separating adjacent features of the ring, wherein the bridges of the innermost ring have an average minimum width (w1), the minimum width of a bridge of a ring being the shortest distance between two adjace
    Type: Application
    Filed: August 19, 2021
    Publication date: December 9, 2021
    Applicant: NKT PHOTONICS A/S
    Inventors: Jens Kristian Lyngsøe, Christian JACOBSEN
  • Publication number: 20210382230
    Abstract: A delivery fiber assembly suitable for delivering broad band light and including a delivery fiber and a connector member. The delivery fiber has a length, an input end for launching light, and a delivery end. The delivery fiber includes along its length a core region and a cladding region surrounding the core region, the cladding region includes a cladding background material having a refractive index Nbg and a plurality of microstructures in the form of inclusions of solid material having refractive index up to Ninc and extending in the length of the longitudinal axis of the delivery fiber, wherein Ninc<Nbg. The plurality of inclusions in the cladding region is arranged in a cross-sectional pattern including at least two rings of inclusions surrounding the core region. The connector member is mounted to the delivery fiber at a delivery end section of the delivery fiber including the delivery end.
    Type: Application
    Filed: August 19, 2021
    Publication date: December 9, 2021
    Applicant: NKT PHOTONICS A/S
    Inventors: Johannes WEIRICH, Martin Dybendal MAACK
  • Publication number: 20210341682
    Abstract: A photonic crystal fiber (PCF) assembly including a PCF and at least one ferrule structure. The PCF includes a core region and a cladding region and a first fiber end section with a first fiber end. The ferrule structure is mounted to the first fiber end section. The ferrule structure includes an inner ferrule arrangement and an outer ferrule arrangement surrounding the first fiber end section. The inner ferrule arrangement includes an inner ferrule front section proximally to the first fiber end and an inner ferrule rear section distally to the first fiber end, and each of the sections has an inner diameter and in at least a length thereof fully surrounds the PCF. The inner ferrule rear section is anchored in an anchor length section to the first fiber end section and the inner ferrule front section supports the first fiber end section proximally to the first fiber end.
    Type: Application
    Filed: May 10, 2021
    Publication date: November 4, 2021
    Applicant: NKT Photonics A/S
    Inventors: Thomas Tanggaard ALKESKJOLD, Jens Kristian LYNGSOE, Christian JAKOBSEN, Martin Dybendal MAACK, Mattia MICHIELETTO, Sidsel Rubner PAPIOR
  • Publication number: 20210333685
    Abstract: A coherent anti-stokes Raman scattering apparatus for imaging a sample includes an optical output; an optical source arranged to generate a first optical signal at a first wavelength; and a nonlinear element arranged to receive the first optical signal, where the nonlinear element is arranged to cause the first optical signal to undergo four-wave mixing on transmission through the nonlinear element such that a second optical signal at a second wavelength and a third optical signal at a third wavelength are generated, wherein an optical signal pair including two of the first, second and third optical signals is provided to the optical output for imaging the sample.
    Type: Application
    Filed: March 3, 2021
    Publication date: October 28, 2021
    Applicant: NKT PHOTONICS A/S
    Inventors: Anatoly Borisovich Grudinin, John Redvers Clowes, Pascal Dupriez, Michael Yarrow
  • Patent number: 11154189
    Abstract: A supercontinuum light source can include a seed laser arranged to provide seed pulses with a pulse frequency Fseed; a pulse frequency multiplier (PFM) arranged to multiply the seed pulses by converting pulses having the pulse frequency Fseed to pump pulses with a pulse frequency Fpump, where Fpump is larger than Fseed; and a non-linear element arranged to receive said pump pulses and convert said pump pulses to pulses of supercontinuum light. The PFM can further include a splitter for splitting pulses into first and second sub beams each having the same pulse frequency, where the PFM is configured such that the sub beams experience different delays; and a combiner for combining said first and second sub beams into a beam having the pulse frequency that is greater than said same pulse frequency. The splitter can have an uneven splitter ratio.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: October 26, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Carsten L. Thomsen, Thomas Vestergaard Andersen, Thomas Feuchter
  • Publication number: 20210323856
    Abstract: A preform element, its production, and fiber production methods from preform assemblies. The preform element has a length and a center axis along its length, a first and second end defined by its length and an outer preform element surface. The preform element includes a plurality of longitudinal structures disposed to form longitudinal hole(s) in a background material. At least one slot extending from its outer preform element surface and intersecting at least one of the longitudinal holes, wherein the at least one slot does not fully intersect the preform element. The preform element may be a preform center element or a preform ring element and may be assembled to a form part of a preform assembly for an optical fiber.
    Type: Application
    Filed: June 24, 2021
    Publication date: October 21, 2021
    Applicant: NKT Photonics A/S
    Inventors: Harald Roager SIMONSEN, Christian JAKOBSEN
  • Patent number: 11152761
    Abstract: 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: Grant
    Filed: May 24, 2019
    Date of Patent: October 19, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Jens E. Pedersen, Poul Varming, Christian V. Poulsen, Thomas O. Fagerhøj, Bjarke Gøth, Henrik Sørensen
  • Publication number: 20210311257
    Abstract: A light source assembly having N outputs, the assembly including: a light source arrangement arranged for supplying light to M inputs, where M an N independently of each other are integers and where M?2 and M?N; at least one optical couplers, each having at least one input arm and a plurality of output arms; and an integer number, P, of mode scramblers. The light source arrangement may include a broadband light source and a multimode coupler configured for receiving one or more light beams from the light source arrangement, wherein the one or more light beams being derived from the broadband light source and wherein a mode scrambler is arranged for mode scrambling one of said light beams before it enters the multimode coupler.
    Type: Application
    Filed: April 19, 2021
    Publication date: October 7, 2021
    Applicant: NKT Photonics A/S
    Inventors: Thomas FEUCHTER, Irnis KUBAT, Timur ISKHAKOV
  • Publication number: 20210311251
    Abstract: A Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and includes a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region includes a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF includes hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further includes a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50° C., preferably 50° C.<Th<250° C.
    Type: Application
    Filed: February 22, 2021
    Publication date: October 7, 2021
    Applicant: NKT Photonics A/S
    Inventors: Thomas Tanggaard ALKESKJOLD, Casper Laur BYG, Christian JAKOBSEN, Jens Kristian LYNGSØE, Kim G. JESPERSEN, Jeppe JOHANSEN, Martin Dybendal MAACK, Martin Erland Vestergaard PEDERSEN, Carsten L. THOMSEN
  • Patent number: 11137541
    Abstract: The invention comprises a delivery fiber assembly suitable for delivering broad band light. The delivery fiber assembly comprises a delivery fiber and a connector member. The deliver has a length, an input end for launching light and a delivery end for delivering light, where the delivery fiber comprises along its length a core region and a cladding region surrounding the core region. The cladding region comprises a cladding background material having a refractive index Nbg and a plurality of inclusions of solid material having refractive index up to Ninc and extending in the length of the longitudinal axis of the delivery fiber, wherein Ninc<Nbg and the plurality of inclusions in the cladding region is arranged in a cross-sectional pattern comprising at least two rings of inclusions surrounding the core region. The connector is mounted to the delivery fiber at a delivery end section of the delivery fiber comprising said delivery end.
    Type: Grant
    Filed: May 11, 2020
    Date of Patent: October 5, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Johannes Weirich, Martin Dybendal Maack
  • Patent number: 11072554
    Abstract: A preform element, it production and fiber production methods from preform assemblies are disclosed. The preform element has a length and a center axis along its length, a first and second end defined by its length and an outer preform element surface. The preform element comprises a plurality of longitudinal structures disposed to form longitudinal hole(s) in a background material. At least one slot extending from its outer preform element surface and intersecting at least one of the longitudinal holes, wherein the at least one slot does not fully intersect the preform element. The preform element may be a preform center element or a preform ring element and may be assembled to a form part of a preform assembly for an optical fiber.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: July 27, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Harald Roager Simonsen, Christian Jakobsen
  • Patent number: 11048145
    Abstract: A method of making a microstructured optical fiber including loading the core and cladding materials of the fiber with hydrogen and deuterium at a loading temperature; annealing the fiber at a selected temperature Tanneal; pumping the fiber with radiation; and reducing the temperature of the fiber and storing the fiber at the reduced temperature before the step of pumping the fiber; and wherein the method allows the hydrogen and the deuterium to become bound to the core material and the cladding material.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: June 29, 2021
    Assignee: NKT PHOTONICS A/S
    Inventor: Carsten L. Thomsen
  • Patent number: 11038316
    Abstract: The invention can include an optical pulse source apparatus that includes the nonlinear generation of wavelengths, wherein the optical pulse source can comprise an oscillator for producing optical pulses, the optical pulses having a first wavelength; an optical fiber amplifier for amplifying optical pulses having the first wavelength; a nonlinear optical fiber receiving amplified optical pulses having the first wavelength to nonlinearly produce optical pulses that include wavelengths that are different than the first wavelength; and wherein the optical pulse source is configured so as to be operable to reduce the optical pulse frequency of the nonlinearly produced optical pulses.
    Type: Grant
    Filed: February 6, 2016
    Date of Patent: June 15, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: John Redvers Clowes, Anatoly Borisovich Grudinin, Ian Michael Godfrey, Kestutis Vysniauskas
  • Patent number: 11002919
    Abstract: A photonic crystal fiber (PCF) assembly including a PCF and at least one ferrule structure. The PCF includes a core region and a cladding region and a first fiber end section with a first fiber end. The ferrule structure is mounted to the first fiber end section. The ferrule structure includes an inner ferrule arrangement and an outer ferrule arrangement surrounding the first fiber end section. The inner ferrule arrangement includes an inner ferrule front section proximally to the first fiber end and an inner ferrule rear section distally to the first fiber end, and each of the sections has an inner diameter and in at least a length thereof fully surrounds the PCF. The inner ferrule rear section is anchored in an anchor length section to the first fiber end section and the inner ferrule front section supports the first fiber end section proximally to the first fiber end.
    Type: Grant
    Filed: January 29, 2020
    Date of Patent: May 11, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Thomas Tanggaard Alkeskjold, Jens Kristian Lyngsøe, Christian Jakobsen, Martin Dybendal Maack, Mattia Michieletto, Sidsel Rübner Papior
  • Patent number: 10989866
    Abstract: A hollow core photonic crystal fiber (PCF) including an outer cladding region and seven hollow tubes surrounded by the outer cladding region. Each of the hollow tubes is fused to the outer cladding to form a ring defining an inner cladding region and a hollow core region surrounded by the inner cladding region. The hollow tubes are not touching each other, but are arranged with distance to adjacent hollow tubes. The hollow tubes each have an average outer diameter d2 and an average inner diameter d1, wherein d1/d2 is equal to or larger than about 0.8, such as equal to or larger than about 0.85, such as equal to or larger than about 0.9. Also, a laser system.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: April 27, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Jens Kristian Lyngsøe, Christian Jakobsen, Mattia Michieletto
  • Patent number: 10983281
    Abstract: A light source assembly having N outputs is disclosed. The assembly comprising: a light source arrangement arranged for supplying light to M inputs, where M an N independently of each other are integers and where M?2 and M?N; at least one optical couplers, each having at least one input arm and a plurality of output arms; and an integer number, P, of mode scramblers; The light source arrangement may comprise a broadband light source and a multimode coupler configured for receiving one or more light beams from the light source arrangement, wherein the one or more light beams being derived from the broadband light source and wherein a mode scrambler is arranged for mode scrambling one of said light beams before it enters the multimode coupler.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: April 20, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Thomas Feuchter, Irnis Kubat, Timur Iskhakov
  • Patent number: 10928584
    Abstract: A Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and includes a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region includes a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF includes hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further includes a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50° C., preferably 50° C.<Th<250° C.
    Type: Grant
    Filed: February 10, 2020
    Date of Patent: February 23, 2021
    Assignee: NKT PHOTONICS A/S
    Inventors: Thomas Tanggaard Alkeskjold, Casper Laur Byg, Christian Jakobsen, Jens Kristian Lyngsøe, Kim G. Jespersen, Jeppe Johansen, Martin Dybendal Maack, Martin Erland Vestergaard Pedersen, Carsten L. Thomsen