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1. WO2020142506 - METHODS FOR SRS PROTECTION OF LASER COMPONENTS AND APPARATUS PROVIDING SRS PROTECTION

Publication Number WO/2020/142506
Publication Date 09.07.2020
International Application No. PCT/US2019/069092
International Filing Date 31.12.2019
IPC
H01S 3/067 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, e.g. laser amplifiers
067Fibre lasers
G02B 6/02 2006.1
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
02Optical fibre with cladding
H01S 3/30 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
30using scattering effects, e.g. stimulated Brillouin or Raman effects
CPC
G02B 6/0208
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
02057comprising gratings
02076Refractive index modulation gratings, e.g. Bragg gratings
0208characterised by their structure, wavelength response
G02B 6/2551
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
24Coupling light guides
255Splicing of light guides, e.g. by fusion or bonding
2551using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
G02B 6/29317
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
24Coupling light guides
26Optical coupling means
28having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
293with wavelength selective means
29304operating by diffraction, e.g. grating
29316Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
29317Light guides of the optical fibre type
H01S 3/0064
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
005Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
0064Anti-reflection devices, e.g. optical isolaters
H01S 3/0078
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
005Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
0078Frequency filtering
H01S 3/0675
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
0675Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
Applicants
  • NLIGHT, INC. [US]/[US]
Inventors
  • FANNING, C. Geoffrey
  • SMALL, Jay
  • KLINER, Dahv A.V.
  • RIVERA, Chris A.
Agents
  • MCGRATH, Ethan A.
  • JONES, Michael D.
Priority Data
62/786,92331.12.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS FOR SRS PROTECTION OF LASER COMPONENTS AND APPARATUS PROVIDING SRS PROTECTION
(FR) PROCÉDÉS DE PROTECTION SRS DE COMPOSANTS LASER ET APPAREIL FOURNISSANT UNE PROTECTION SRS
Abstract
(EN)
Apparatus include a first optical fiber including a core situated to propagate a signal beam at a signal wavelength and an unwanted stimulated Raman scattering (SRS) beam at an SRS wavelength associated with the signal wavelength, and a fiber Bragg grating (FBG) situated in a core of a second optical fiber optically coupled to the core of the first optical fiber, the FBG having a selected grating reflectivity associated with the SRS wavelength and being situated to reflect the SRS beam back along the core of the second optical fiber and to reduce a damage associated with propagation of the SRS beam to power sensitive laser system components optically coupled to the second optical fiber. Methods are also disclosed.
(FR)
La présente invention porte sur un appareil comportant une première fibre optique comprenant un cœur situé de façon à propager un faisceau de signal à une longueur d'onde de signal et un faisceau de diffusion Raman stimulée (SRS) indésirable à une longueur d'onde de SRS associée à la longueur d'onde de signal, et un réseau de Bragg sur fibre (FBG) situé dans un cœur d'une seconde fibre optique couplée optiquement au cœur de la première fibre optique, le FBG ayant une réflectivité de réseau choisie associée à la longueur d'onde de SRS et étant situé de façon à rétro-réfléchir le faisceau SRS le long du cœur de la seconde fibre optique et à réduire un endommagement associé à la propagation du faisceau SRS causé à des composants de système laser sensibles à la puissance couplés optiquement à la seconde fibre optique. Des procédés sont également décrits.
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