# US 7,609,447 B2 · Programmable optical processing device employing stacked light modulator elements in fractional Fourier planes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,447 B2 - Document ID: US7609447B2 - Status: Granted - Kind: B2 - Application number: 11/929,259 - Filed: 2007-10-30 - Published: 2008-03-06 - Granted: 2009-10-27 - Earliest claimed: 1999-02-25 - Inventors: Lester F. Ludwig - Web page: https://patentgrep.com/patent/US7609447B2 ## CPC - G06E 1/00: Devices for processing exclusively digital data - G02B 27/46: Systems using spatial filters - G06E 3/00: Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data - G06E 3/003: {forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions} - Y10S 359/90: Methods - G06E: OPTICAL COMPUTING DEVICES (digital storage using optical elements G11C13/04) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A monolithic or hybrid integrated optical processor or optical processing system having a plurality of light modulating array elements, each controlled by respective control signals, and arranged so that each light modulating array element lies in a different fractional Fourier transform plane. In various embodiments, at least a portion of the resulting system is implemented in a stack of element materials. In one embodiment, a segment of graded index material lies between consecutive light modulating array elements. Other features include obtaining images from an electronically-controllable image source, using an image sensor to change the processed image into an electrical output, and using at least one of the light modulating array element to introduce a phase shift. ## Claims ### Claim 1 An optical processing system, said system comprising: an electronically-controllable image source for emitting an optical image responsive to at least one incoming electronic image signal; a first imaging optical element having two distinct sides, the first imaging optical element configured to accept the optical image at one of the two sides and to alter the optical image according to a imaging process, and to provide a first altered optical image from the second of the two sides of the element; a plurality of light-modulator array elements, at least a plurality of which are responsive to associated incoming light-modulation control signals associated with fractional Fourier plane transfer functions, and adjacently stacked so that consecutive pairs of light-modulator array elements are immediately adjacent with one another so as to form a stack with a first image passing surface at one edge of the stack and a second image passing surface at the other edge of the stack, the plurality of light-modulator array elements arranged so that the first image passing surface receives the first altered optical image, the second image passing surface providing a second altered optical image; a second imaging image forming element arranged to receive the second altered optical image at one of two sides; and an electronic image sensor facing the second of the two sides of the second imaging image forming element; wherein the emitted optical image is directed through the first imaging image forming element, producing an optical field directed through the stacked plurality of light-modulator array elements and subsequently directed through the second imaging image forming element and sensed by the electronic image sensor. ### Claim 2 (depends on 1) The optical processing system of claim 1 wherein the optical processing system is one from the group of: a monolithic integrated optical processor and a hybrid integrated optical processor. ### Claim 3 (depends on 1) The optical processing system of claim 1 wherein the imaging material has a quadratic phase shift characteristic. ### Claim 4 (depends on 1) The optical processing system of claim 1 wherein at least one of the first imaging optical element and the second imaging optical element comprises a lens. ### Claim 5 (depends on 1) The optical processing system of claim 1 wherein at least one of the first imaging optical element and the second imaging optical element comprises GRIN material. ### Claim 6 (depends on 1) The optical processing system of claim 1 wherein at least one of the incoming light-modulation control signals comprises information calculated by an associated processor. ### Claim 7 (depends on 1) The optical processing system of claim 1 wherein at least one of the incoming light-modulation control signals comprises information stored in an associated memory. ### Claim 8 (depends on 1) The optical processing system of claim 1 wherein at least one of the plurality of light-modulator array elements is implemented with an LCD. ### Claim 9 (depends on 1) The optical processing system of claim 1 wherein at least one of the plurality of light-modulator array elements shifts the phase of light transmitted through it. ### Claim 10 An optical processing system, said system comprising: an electronically-controllable image source for emitting an optical image responsive to at least one incoming electronic image signal to create an emitted optical image; a first optical element having two distinct sides, accepting the emitted optical image at one of the two sides of the element, altering the emitted optical image, and providing a first altered light from the second of the two sides; a stacked plurality of light-modulator array elements, at least a plurality of which are responsive to associated incoming light-modulation control signals, providing a second altered light, and wherein incoming control signal is associated with transfer functions associated with fractional Fourier planes; a second optical element arranged to receive the second altered light; and an electronic image sensor facing the opposite side of the second optical element, the electronic image sensor operating as an optical observation element; wherein the emitted optical image is directed through the first optical element, producing an optical field directed through the stacked plurality of lightmodulator array elements and subsequently directed through the second optical element and sensed by the electronic image sensor. ### Claim 11 (depends on 10) The optical processing system of claim 10 wherein at least one of the electronically-controllable image source and the electronic image sensor comprises an LED array. ### Claim 12 (depends on 10) The optical processing system of claim 10 wherein the optical processing system is configured as a hybrid physical realization of an integrated optical processor. ### Claim 13 (depends on 10) The optical processing system of claim 10 wherein the graded-index material has a quadratic phase shift characteristic. ### Claim 14 (depends on 10) The optical processing system of claim 10 wherein at least one of the first graded-index optical element and the second graded-index optical element comprises a lens. ### Claim 15 (depends on 10) optical processing system of claim 10 wherein at least one of the first graded-index optical element and the second graded-index optical element comprises GRIN material. ### Claim 16 (depends on 10) The optical processing system of claim 10 wherein at least one of the incoming light-modulation control signals comprises information calculated by an associated processor. ### Claim 17 (depends on 10) The optical processing system of claim 10 wherein at least one of the incoming light-modulation control signals comprises information stored in an associated memory. ### Claim 18 (depends on 10) The optical processing system of claim 10 wherein at least one of the plurality of light-modulator array is implemented with an LCD. ### Claim 19 (depends on 10) The optical processing system of claim 10 wherein at least one of the plurality of light-modulator array shifts the phase of light transmitted through it.