# US 11,121,772 B2 · Smart laser light for a vehicle

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- Number: US 11,121,772 B2
- Document ID: US11121772B2
- Status: Granted
- Kind: B2
- Application number: 15/954,493
- Filed: 2018-04-16
- Published: 2019-10-24
- Granted: 2021-09-14
- Earliest claimed: 2017-09-28
- Assignees: KYOCERA SLD Laser, Inc.
- Applicants: KYOCERA SLD Laser, Inc.
- Inventors: Melvin McLaurin; James W. Raring; Paul Rudy; Vlad Novotny
- Web page: https://patentgrep.com/patent/US11121772B2

## CPC

- H04B 10/116: Visible light communication
- G02B 19/0057: {in the form of a laser diode array, e.g. laser diode bar (semiconductor laser arrays with beam combining arrangement H01S5/4012)}
- G02B 27/0916: {Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers (coupling into light guides using intermediate optical elements G02B6/4204; details of lighting devices in general F21V)}
- H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)}
- H01S 5/0087: {for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials}
- H01S 5/02251: using optical fibres
- H01S 5/34333: {with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser}
- H01S 5/4012: {Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms}
- H04B 10/502: {LED transmitters}
- H01S 5/0071: {for beam steering, e.g. using a mirror outside the cavity to change the beam direction}
- H01S 5/0202: {Cleaving}
- H01S 5/0203: {Etching}
- H01S 5/02212: Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
- H01S 5/02216: Butterfly-type, i.e. with electrode pins extending horizontally from the housings
- H01S 5/02326: Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
- H01S 5/02345: Wire-bonding
- H01S 5/026: Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers (stabilisation of output H01S5/06)
- H01S 5/04254: {characterised by the shape}
- H01S 5/04256: {characterised by the configuration}
- H01S 5/1039: {Details on the cavity length}
- H01S 5/2009: {by using electron barrier layers}
- H01S 5/22: having a ridge or stripe structure
- H01S 5/2201: {in a specific crystallographic orientation}
- H01S 5/3202: {grown on specifically orientated substrates, or using orientation dependent growth}
- H01S 5/4031: {Edge-emitting structures}
- H01S 5/4087: {emitting more than one wavelength}
- H01S 5/4093: {Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion}
- H04B 10/114: Indoor or close-range type systems
- H04B 10/1141: {One-way transmission}
- H04B 10/5057: {using a feedback signal generated by analysing the optical output}
- H04B 10/524: Pulse modulation
- H04B 10/564: Power control
- H04B 10/572: Wavelength control
- H04B 10/60: Receivers
- H10H 20/042: {Superluminescent diodes}
- H04B: TRANSMISSION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H01S: DEVICES 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
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A smart light source configured for visible light communication. The light source includes a controller comprising a modem configured to receive a data signal and generate a driving current and a modulation signal based on the data signal. Additionally, the light source includes a light emitter configured as a pump-light device to receive the driving current for producing a directional electromagnetic radiation with a first peak wavelength in the ultra-violet or blue wavelength regime modulated to carry the data signal using the modulation signal. Further, the light source includes a pathway configured to direct the directional electromagnetic radiation and a wavelength converter optically coupled to the pathway to receive the directional electromagnetic radiation and to output a white-color spectrum. Furthermore, the light source includes a beam shaper configured to direct the white-color spectrum for illuminating a target of interest and transmitting the data signal.

## Claims

### Claim 1

A light source for a vehicle with spatially modulated illumination comprising:
a controller configured to receive input data information for generating one or more first control signals and one or more second control signals, at least a portion of the input data information for transmission;
a light emitter configured as a pump-light device comprised of a gallium and nitrogen containing material and an optical cavity; the optical cavity comprising an optical waveguide region and one or more facet regions, wherein the optical cavity is configured with electrodes to supply a driving current based on at least one of the one or more first control signals to the gallium and nitrogen containing material, wherein the driving current provides an optical gain to an electromagnetic radiation propagating in the optical waveguide region, wherein the electromagnetic radiation is outputted through at least one of the one or more facet regions as a directional electromagnetic radiation characterized by a first peak wavelength in the ultra-violet or blue wavelength regime;
a beam shaper configured to collimate and focus the directional electromagnetic radiation to a certain direction and focal point;
an optical pathway for guiding the directional electromagnetic radiation;
wherein the optical pathway comprises an optical fiber configured to guide the directional electromagnetic radiation to a beam steering optical element;
wherein the beam steering optical element is a micro-electromechanical system (MEMS) mirror configured to manipulate the directional electromagnetic radiation based on at least one of the one or more second control signals to provide a spatially modulated excitation of a wavelength converter optically coupled to the directional electromagnetic radiation from the pump-light device;
wherein the wavelength converter is configured to absorb at least a fraction of the directional electromagnetic radiation with the first peak wavelength to excite a spectrum with a second peak wavelength that is longer than the first peak wavelength and to provide an output electromagnetic radiation with a white-color spectrum comprising at least the second peak wavelength and partially the first peak wavelength;
wherein the wavelength converter comprises a single phosphor material having a substantially uniform composition with a single color conversion property, the MEMS mirror is configured to manipulate the directional electromagnetic radiation and provide the spatially modulated excitation of the single phosphor material, and the single phosphor material is configured in a reflection mode to have a surface receiving the directional electromagnetic radiation in an incident angle, wherein the output electromagnetic radiation is a combination of a spectrum of the second peak wavelength converted by the single phosphor material and a fraction of the electromagnetic radiation with the first peak wavelength reflected from the surface of the single phosphor material and/or scattered from the interior of the single phosphor material; and
a beam shaper configured to collimate a beam of the white-color spectrum to a certain direction or a certain focal point.

### Claim 2 (depends on 1)

The light source of claim 1, wherein the pump-light device comprises a laser diode device.

### Claim 3 (depends on 1)

The light source of claim 1, wherein the pump-light device comprises one or more laser diodes.

### Claim 4 (depends on 1)

The light source of claim 1, wherein the pump-light device comprises a superluminescent diode (SLED) device.

### Claim 5 (depends on 1)

The light source of claim 1, wherein the light emitter is disposed in a first package, and the beam steering optical element and the wavelength converter are disposed in a second package separate from the first package, and wherein the optical pathway guides the directional electromagnetic radiation from the first package to the second package.

### Claim 6 (depends on 1)

The light source of claim 1, wherein the single phosphor material comprises a sintered YAG phosphor or a single crystal YAG phosphor.

### Claim 7

A light source with spatially modulated illumination comprising:
a controller configured to receive input data information for generating one or more first control signals and one or more second control signals, at least a portion of the input data information for transmission;
a light emitter configured as a pump-light device comprised of a gallium and nitrogen containing material and an optical cavity; the optical cavity comprising an optical waveguide region and one or more facet regions, wherein the optical cavity is configured with electrodes to supply a driving current based on at least one of the one or more first control signals to the gallium and nitrogen containing material, wherein the driving current provides an optical gain to an electromagnetic radiation propagating in the optical waveguide region, wherein the electromagnetic radiation is outputted through at least one of the one or more facet regions as a directional electromagnetic radiation characterized by a first peak wavelength in the ultra-violet or blue wavelength regime;
a beam shaper configured to collimate and focus the directional electromagnetic radiation to a certain direction and focal point;
an optical pathway for guiding the directional electromagnetic radiation;
wherein the optical pathway comprises an optical fiber configured to guide the directional electromagnetic radiation to a beam steering optical element;
wherein the beam steering optical element is configured to manipulate the directional electromagnetic radiation based on at least one of the one or more second control signals to provide a spatially modulated excitation of a wavelength converter optically coupled to the directional electromagnetic radiation from the pump-light device;
wherein the wavelength converter comprises a phosphor material having a substantially uniform composition with a single color conversion property, the beam steering optical element is configured to manipulate the directional electromagnetic radiation for providing the spatially modulated excitation of the phosphor material, and the wavelength converter is configured to absorb at least a fraction of the directional electromagnetic radiation with the first peak wavelength to excite a spectrum with a second peak wavelength that is longer than the first peak wavelength and to provide an output electromagnetic radiation with a white-color spectrum comprising at least the second peak wavelength and partially the first peak wavelength; and
a beam shaper configured to collimate a beam of the white-color spectrum to a certain direction or a certain focal point.

### Claim 8 (depends on 7)

The light source of claim 7, wherein the pump-light device comprises a laser diode device.

### Claim 9 (depends on 7)

The light source of claim 7, wherein the pump-light device comprises a superluminescent diode (SLED) device.

### Claim 10 (depends on 7)

The light source of claim 7, wherein the beam steering optical element is selected from one of a micro-electromechanical system (MEMS) mirror, a digital light processing (DLP) chip, a digital mirror device (DMD), or a liquid crystal on silicon (LCOS) chip and is configured for steering, patterning, or pixelating the output electromagnetic radiation.

### Claim 11 (depends on 7)

The light source of claim 7, wherein the spatially modulated illumination is configured as a spot light system such as a flashlight, spotlight, automobile headlamp or any direction light applications where light must be directed or projected to a specified location or area.

### Claim 12 (depends on 7)

The light source of claim 7, wherein the phosphor material is configured in a reflection mode to have a surface receiving the directional electromagnetic radiation in an incident angle, wherein the output electromagnetic radiation is a combination of a spectrum of the second peak wavelength converted by the phosphor material, a fraction of the directional electromagnetic radiation with the first peak wavelength reflected from the surface of the phosphor material, and a fraction of the directional electromagnetic radiation scattered from interior of the phosphor material.

### Claim 13 (depends on 7)

The light source of claim 7, wherein the phosphor material is configured in a transmission mode to receive the directional electromagnetic radiation passed through, wherein the output electromagnetic radiation is a combination of a fraction of the directional electromagnetic radiation not absorbed by the phosphor material and a spectrum of the second peak wavelength converted by the phosphor material.