# US 10,502,882 B2 · Light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,882 B2 - Document ID: US10502882B2 - Status: Granted - Kind: B2 - Application number: 15/520,287 - Filed: 2015-10-21 - Published: 2017-11-16 - Granted: 2019-12-10 - Earliest claimed: 2014-10-21 - Assignees: Imperial Innovations Limited - Applicants: Imperial Innovations Limited - Inventors: Juna Sathian; Mark Oxborrow - Web page: https://patentgrep.com/patent/US10502882B2 ## CPC - G02B 6/0003: {the light guides being doped with fluorescent agents} - G02B 6/0011: {the light guides being planar or of plate-like form} - A61B 2018/00589: {Coagulation} - A61N 2005/0651: {Diodes} - A61N 2005/0663: {Coloured light} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract There is provided a light source arranged to output light at a first wavelength. The light source comprises a luminescent concentrator having a slab-shaped geometry. The luminescent concentrator comprises: an input port arranged to receive light and define a first area; an output port arranged to transmit light and define a second area which is smaller than the first area; and surfaces arranged to direct light inside the luminescent concentrator to the output port. The luminescent concentrator further comprises lumophores arranged to receive light at a second wavelength and emit light at the first wavelength; and a pump light supply coupled to the input port and arranged to illuminate the input port with light at the second wavelength. ## Claims ### Claim 1 A light source arranged to output light at a first wavelength, the light source comprising: a luminescent concentrator having a slab-shaped geometry with a width to thickness ratio of greater than 7:1, the luminescent concentrator comprising: an input port arranged to receive light and define a first area; an output port arranged to transmit light and define a second area which is smaller than the first area; surfaces arranged to direct light inside the luminescent concentrator to the output port; wherein the luminescent concentrator further comprises lumophores arranged to receive light at a second wavelength and emit light at the first wavelength; and a pump light supply coupled to the input port and arranged to illuminate the input port with light at the second wavelength. ### Claim 2 (depends on 1) The light source as claimed in claim 1 wherein the luminescent concentrator has a length to width ratio of greater than 10:1. ### Claim 3 (depends on 1) The light source as claimed in claim 1 wherein the luminescent concentrator has a thickness of less than 1 millimeter. ### Claim 4 (depends on 1) The light source as claimed in claim 1 wherein the luminescent concentrator has a width of less than 20 millimeters. ### Claim 5 (depends on 1) The light source as claimed in claim 1 wherein the luminescent concentrator has a length of less than 5 meters. ### Claim 6 (depends on 1) The light source as claimed in claim 1 wherein the emitted light at the second wavelength has a maximum luminance of less than 100 watts per square millimeter per steradian. ### Claim 7 (depends on 1) The light source as claimed in claim 1 wherein the lumophore is a fluorophore or a phosphor. ### Claim 8 (depends on 1) The light source as claimed in claim 1 wherein the luminescent concentrator comprises Cerium-doped YAG. ### Claim 9 (depends on 1) The light source as claimed in claim 1 wherein the light supply is a planar LED array. ### Claim 10 (depends on 1) A luminescent concentrator system comprising: the light source of claim 1; and an optical coupler comprising: a first port arranged to couple with an output port of the luminescent concentrator and define a first area; a second port defining a second area having an aspect ratio different to the first area; and a substantially adiabatic taper arranged to guide light from the first port to the second port. ### Claim 11 (depends on 10) The luminescent concentrator system as claimed in claim 10 wherein the aspect ratio of the second area is less than the aspect ratio of the first area. ### Claim 12 (depends on 10) The luminescent concentrator system as claimed in claim 10 having a fishtail shape. ### Claim 13 (depends on 10) The luminescent concentrator system as claimed in claim 10 arranged such that light is guided along the substantially adiabatic taper by internal reflection. ### Claim 14 (depends on 10) The luminescent concentrator system as claimed in claim 10 wherein the optical coupler is passive. ### Claim 15 (depends on 1) A luminescent concentrator system comprising: a light source of claim 1 and further comprising: an optical coupler having: a first port arranged to couple with the output port of the luminescent concentrator, wherein the first port defines a first area with a first aspect ratio; a second port that defines a second area having a second aspect ratio that is different than the first aspect ratio; and an adiabatic taper arranged to guide the light from the first port to the second port. ### Claim 16 A method of processing light, the method comprising the following steps: receiving the light at a first wavelength with a luminescent concentrator having a slab-shaped geometry with a width to thickness ratio of greater than 7:1 and a first port that defines a first area through which the light is received; converting the light to a second wavelength; and directing the light at the second wavelength to a second port of the luminescent concentrator that defines a second area which is smaller than the first area; receiving the light at the second wavelength from the second port with an optical coupler having a longitudinal adiabatic taper and a third port; and directing the light at the second wavelength using the longitudinal adiabatic taper to the third port that has an aspect ratio that is different than the aspect ratio of the second port. ### Claim 17 (depends on 16) The method as claimed in claim 16 wherein the first wavelength is in the range 450 to 495 nanometers and the second wavelength is in the range 570 to 590 nanometers. ### Claim 18 (depends on 16) The method as claimed in claim 16 wherein the step of converting the light to a second wavelength is performed by a fluorophore.