# US 10,372,081 B2 · Holographic display device and method involving ionization of air by infrared radiation for rotated 3-D image > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,372,081 B2 - Document ID: US10372081B2 - Status: Granted - Kind: B2 - Application number: 15/663,427 - Filed: 2017-07-28 - Published: 2017-11-23 - Granted: 2019-08-06 - Earliest claimed: 2017-07-28 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Kapil Kanugo - Web page: https://patentgrep.com/patent/US10372081B2 ## CPC - G03H 1/2294: {Addressing the hologram to an active spatial light modulator} - G02B 30/56: by projecting aerial or floating images - H01S 3/1022: {by controlling the optical pumping} - H04N 13/365: using digital micromirror devices [DMD] - H04N 13/395: with depth sampling, i.e. the volume being constructed from a stack or sequence of two-dimensional [2D] image planes - H01S 3/005: {Optical 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 (shaping laser beam for working metal or other materials B23K26/06; optical elements, systems or apparatus in general G02B)} - H01S 3/09415: {the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping} - H01S 3/1611: {neodymium} - H01S 3/1643: {YAG} - G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00}) - 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 - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Systems, devices and methods are described including providing infrared (IR) laser radiation to a Digital Micromirror Device (DMD) array and using the DMD array to spatially modulate the IR laser radiation. The spatially modulated IR laser radiation may then be projected to form a voxel array where each voxel of the array represents to a volume of air wherein the IR laser radiation has been focused sufficiently to cause air to ionize. The voxel array may then be spatially rotated. ## Claims ### Claim 1 A device, comprising: a first infrared (IR) laser diode to provide first IR radiation having a first wavelength; a digital micromirror device (DMD) array to spatially modulate the first IR radiation; a second IR laser diode to receive the spatially modulated first IR radiation from the DMD array and to generate spatially modulated second IR radiation at a second wavelength longer than the first wavelength; and optics to project the spatially modulated second IR radiation according to coordinates to create a voxel array, wherein each voxel of the voxel array is to correspond to a volume of air, and wherein the second IR radiation is to be focused to cause ionization of air at one or more voxels forming the voxel array to represent a two-dimensional (2D) image frame of a three-dimensional (3D) holographic image, and wherein the coordinates associated with the 2D image frame represented by the voxel array are to be periodically adjusted to rotate display of the 3D holographic image by the optics. ### Claim 2 (depends on 1) The device of claim 1, wherein the second IR laser diode comprises a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser diode. ### Claim 3 (depends on 2) The device of claim 2, wherein the first wavelength comprises 808 nm, and wherein the second wavelength comprises 1064 nm. ### Claim 4 (depends on 1) The device of claim 1, wherein the optics comprise planar optics and a projection lens. ### Claim 5 A method, comprising: providing, via a first infrared (IR) laser diode, a first IR radiation having a first wavelength; spatially modulating, via a digital micromirror device (DMD) array, the first IR radiation; receiving, via a second IR laser diode, the spatially modulated first IR radiation from the DMD array and generating, via the second IR laser diode, spatially modulated second IR radiation at a second wavelength longer than the first wavelength; and projecting, via optics, the spatially modulated second IR radiation according to coordinates to create a voxel array, wherein each voxel of the voxel array is to correspond to a volume of air, and wherein the second IR radiation is to be focused to cause ionization of air at one or more voxels forming the voxel array to represent a two-dimensional (2D) image frame of a three-dimensional (3D) holographic image, and wherein the coordinates associated with the 2D image frame represented by the voxel array are to be periodically adjusted to rotate display of the 3D holographic image via the optics. ### Claim 6 (depends on 5) The method of claim 5, wherein the second IR laser diode comprises a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser diode. ### Claim 7 (depends on 6) The method of claim 6, wherein the first wavelength comprises 808 nm, and wherein the second wavelength comprises 1064 nm. ### Claim 8 (depends on 6) The method of claim 6, wherein the optics comprise planar optics and a projection lens. ### Claim 9 (depends on 5) The method of claim 5, wherein the first IR radiation is spatially modulated using a beam splitter. ### Claim 10 (depends on 5) The method of claim 5, wherein each voxel is to specify a 3D location in the 3D holographic image, the array of voxels together to form the 2D image frame of the 3D holographic image. ### Claim 11 (depends on 5) The method of claim 5, wherein positioning of the 2D image frame within the 3D holographic image is to be periodically changed to facilitate ionization of the air by the second IR laser radiation. ### Claim 12 (depends on 1) The device of claim 1, wherein the first IR radiation is to be spatially modulated using a beam splitter. ### Claim 13 (depends on 1) The device of claim 1, wherein the DMD array is to be part of a DMD module including a relay lens, a projection lens, and the DMD array. ### Claim 14 (depends on 1) The device of claim 1, wherein content of the 2D image frame is to be specified by a host system module and conveyed to the DMD array. ### Claim 15 (depends on 1) The device of claim 1, wherein each voxel is to specify a 3D location in the 3D holographic image, the array of voxels together to form the 2D image frame of the 3D holographic image. ### Claim 16 (depends on 1) The device of claim 1, wherein positioning of the 2D image frame within the 3D holographic image is to be periodically changed to facilitate ionization of the air by the second IR laser radiation.