公开(公告)号：US20250105581A1

公开(公告)日：2025-03-27

申请号：US18729527

申请日：2023-01-16

Applicant: NKT PHOTONICS A/S

Inventor： Thomas Vestergaard ANDERSEN

IPC: H01S3/137 ,  G01J3/28 ,  G01K1/14 ,  H01S3/00 ,  H01S3/067 ,  H01S3/1118 ,  H01S3/16

Abstract: A wavelength-stabilised narrow-linewidth mode-locked picosecond laser system comprises a laser cavity which includes an amplifier, a mode-locking element, and a fiber Bragg grating which acts as a narrowband reflector. The system includes a mount to which the fiber Bragg grating is mounted under tension, a tension control system to adjust the tension, and a measurement device to provide a measurement output related to a current operating wavelength of the fiber Bragg grating. A microcontroller or other controller wavelength-stabilises the laser by controlling the tension control system responsive to the measured wavelength.

公开(公告)号：US12253787B2

公开(公告)日：2025-03-18

申请号：US18631570

申请日：2024-04-10

Applicant: NKT Photonics A/S

Inventor： Carsten L. Thomsen

IPC: G02F1/365 ,  A61B1/06 ,  F21V8/00 ,  G02B6/02 ,  H01S3/30 ,  G02B6/42 ,  G02B6/44 ,  G02F1/35

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.

公开(公告)号：US12210266B2

公开(公告)日：2025-01-28

申请号：US18344442

申请日：2023-06-29

Applicant: NKT PHOTONICS A/S

Inventor： Cameron Lesley Colwell Smith ,  Alexandra Lupi ,  Martin Erland Vestergaard Pedersen ,  Jens Kristian Lyngsø ,  Martin D. Maack

IPC: G02F1/35 ,  G02F1/365

Abstract: An optical source (100) comprising a supercontinuum generation apparatus comprising a pump light source (102), a twisted photonic crystal fibre, PCF, (104) and a wideband quarter-wave retarder (106). The pump light source is arranged to provide circularly polarised pump light. The twisted PCF is arranged to receive the pump light and to convert the pump light into circularly polarised supercontinuum light. The wideband quarter-wave retarder is arranged to convert the circularly polarised supercontinuum light into linearly polarised supercontinuum light. The optical source may additionally comprise a wavelength tunable bandpass optical filter arranged to transmit the linearly polarised supercontinuum light at wavelengths within a selected range.

公开(公告)号：US20240425404A1

公开(公告)日：2024-12-26

申请号：US18828508

申请日：2024-09-09

Applicant: NKT Photonics A/S

Inventor： Christian Jakobsen ,  Harald Roager Simonsen ,  Jens Kristian Lyngsøe ,  Mattia Michieletto

IPC: C03B37/012 ,  C03B37/025 ,  C03B37/027 ,  G02B6/02

Abstract: A method of producing a microstructured optical fiber is disclosed. The method includes providing a preform and drawing the preform. The preform has a center axis, a length and a first end and a second end and has at least one longitudinal hole extending lengthwise. The method includes inserting a first end of a pressure tube into the hole of the preform at the first end of the preform and subjecting the hole of the preform to a controlled pressure via the pressure tube during the drawing.

公开(公告)号：US12110248B2

公开(公告)日：2024-10-08

申请号：US16096878

申请日：2017-04-27

Applicant: NKT Photonics A/S

Inventor： Christian Jakobsen ,  Harald Roager Simonsen ,  Jens Kristian Lyngsøe ,  Mattia Michieletto

IPC: C03B37/012 ,  C03B37/025 ,  C03B37/027 ,  G02B6/02

CPC classification number: C03B37/0122 ,  C03B37/0253 ,  C03B37/02781 ,  G02B6/02295 ,  G02B6/02314 ,  C03B2203/16 ,  C03B2203/42 ,  C03B2205/10 ,  C03B2205/12

Abstract: A method of producing a microstructured optical fiber is disclosed. The method includes providing a preform and drawing the preform. The preform has a center axis, a length and a first end and a second end and has at least one longitudinal hole extending lengthwise. The method includes inserting a first end of a pressure tube into the hole of the preform at the first end of the preform and subjecting the hole of the preform to a controlled pressure via the pressure tube during the drawing.

公开(公告)号：US20240248252A1

公开(公告)日：2024-07-25

申请号：US18576972

申请日：2022-07-01

Applicant: NKT PHOTONICS A/S

Inventor： Mattia MICHIELETTO ,  Martin Erland Vestergaard PEDERSEN ,  Martin MAACK ,  Mette Marie JOHANSEN

IPC: G02B6/02

CPC classification number: G02B6/02361 ,  G02B6/02214 ,  G02B6/02333 ,  G02B6/02347

Abstract: An optical fiber for guiding an optical signal, the optical fiber includes: a core region; a cladding region surrounding the core region, the cladding region including an inner cladding region and an outer cladding region, wherein a plurality of the plurality of inner cladding features are of a first type of feature, wherein a plurality of the plurality of inner cladding features are of a second type of feature including an air hole in direct contact with the background material having a refractive index, nb, and wherein the inner cladding features are arranged in a substantially hexagonal lattice and the six nearest neighbors surrounding a first type of feature are of the second type of feature, and wherein no first type of feature is surrounded by less than six nearest neighbors of the second type of feature.

公开(公告)号：USRE50026E1

公开(公告)日：2024-06-25

申请号：US16741186

申请日：2020-01-13

Applicant: NKT Photonics A/S

Inventor： Paulo Almeida ,  John Redvers Clowes ,  Pascal Dupriez ,  Anatoly Borisovich Grudinin

IPC: H01S3/10 ,  H01S3/067 ,  H01S3/1112 ,  H01S3/13 ,  H01S3/00 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/16 ,  H01S3/23

CPC classification number: H01S3/06754 ,  H01S3/1112 ,  H01S3/0057 ,  H01S3/094003 ,  H01S3/0941 ,  H01S3/1618 ,  H01S3/2383 ,  H01S2301/08

Abstract: A method of tuning the time duration of laser output pulses, the method including spectrally dispersing optical pulses and further comprising providing an optical pulse having a time duration and a spectral bandwidth; spectrally dispersing (243, 245) the optical pulse so as to provide a selected change in the time duration of the pulse responsive to the spectral bandwidth of the pulse; outputting (226) an optical output pulse having a first time duration that is responsive to the selected change in time duration; providing another optical pulse; changing the amount of spectral bandwidth of the another optical pulse (272) to be different than that of the optical pulse or changing the amount of spectral dispersion so that spectrally dispersing the another optical pulse provides a change in time duration that is different than the selected change; and outputting (226) another optical output pulse having a second time duration that is responsive to the different change in time duration, the second time duration of the another optical output pulse being different than the first time duration of the optical output pulse.

公开(公告)号：US11699891B2

公开(公告)日：2023-07-11

申请号：US17479373

申请日：2021-09-20

Applicant: NKT PHOTONICS A/S

Inventor： Jens E. Pedersen ,  Poul Varming ,  Christian V. Poulsen ,  Thomas O. Fagerhoj ,  Bjarke Goth ,  Henrik Sorensen

IPC: H01S5/0687 ,  H01S5/065 ,  H01S5/14 ,  G01B9/02001 ,  H01S3/23 ,  H01S5/40 ,  H01S5/02251

CPC classification number: H01S5/0687 ,  G01B9/02001 ,  H01S3/2391 ,  H01S5/02251 ,  H01S5/0654 ,  H01S5/141 ,  H01S5/4087 ,  H01S2301/02

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.

公开(公告)号：US20230033071A1

公开(公告)日：2023-02-02

申请号：US17786775

申请日：2020-12-21

Applicant: NKT PHOTONICS A/S

Inventor： Thomas Vestergaard ANDERSEN

IPC: G02F1/35 ,  G02F1/365 ,  H01S3/00

Abstract: A light source, including: a pulse generator for providing an initial sequence of light pulses, the pulse generator including an optical source for producing optical pulses; and a modulator in communication with the optical source for increasing or decreasing the selected number of pulses provided by the pulse generator in the selected time period; first and second optical arms, for propagating, respectively, first and second sequences of light pulses, wherein the first optical arm includes a first manipulator configured to generate the first sequence of light pulses from the initial sequence of light pulses, wherein the light source includes a nonlinear optical element arranged to receive the first sequence of light pulses or the second sequence of light pulses, and an optical switch arranged to switch either the first sequence of light pulses or the second sequence of light pulses for reception by the nonlinear optical element.

公开(公告)号：US11221445B2

公开(公告)日：2022-01-11

申请号：US16797182

申请日：2020-02-21

Applicant: NKT PHOTONICS A/S

Inventor： Carsten L. Thomsen ,  Thomas T. Alkeskjold ,  Erik B. Thomsen

IPC: G02B6/02 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/00 ,  G02F1/35 ,  H01S3/067 ,  G02B6/036 ,  G02F1/365 ,  G01B9/02 ,  H01S3/11 ,  H01S3/113 ,  H01S3/131 ,  H01S3/16

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.