214x Filetype PPT File size 0.96 MB Source: lapt.ece.northwestern.edu
We propose to by-pass electronic recalling by using the SPHRAM-JTC architecture INPUT IMAGE HOLOGRAPHIC FT LENS MUX/ DEMUX BEAM EXPANDER IMAGE HOLOGRAPHIC SHUTTER S2 FLATTENING MEMORY UNIT REDUCING BEAM TELESCOPE EXPANDER FILTER IMAGE SHUTTER APERTURE S1 FT LENS REDIRECTOR REDIRECTOR DYNAMIC CORRELATION BEAM HOLOGRAM SHUTTER ARRAY IMAGING BEAM CCD DEFLECTOR TTAARGRGEET T IIDD:: 77996688 TTAARRGGEET T IID:D: 77996688002233 IMAGING CCD RETRIEVED IMAGE READ LASER Images stored in the Super-Parallel Holographic RAM will be correlated in a translation-invariant manner. We will use a joint-transform correlator architecture based on a high speed dynamic holographic material. M.S. Shahriar, R. Tripathi, M. Kleinschmit, J. Donoghue, W. Weathers, M. Huq, and J.T. Shen, “Superparallel Holographic Correlator for Ultrafast Database Searches,” Opt. Lettt. 28, 525-527 (2003) M.S. Shahriar, R. Tripathi, M. Huq, J. Donoghue, and J.T. Shen, “Shared-Hardware Alternating Operation of a Superparallel Holographic Optical Correlator and Super-Parallel Holographic Random Access Memory,” Opt. Eng. 43, 1856-1861 (2004) Translation-invariant VanderLugt-type correlation of images stored via angle-multiplexing in Memplex® material Recorded trace Memplex® Thin Holographic Fourier- Holographic DC-suppressed Transforming Memory Unit filter Lens Read Beam CCD Image reconstructed from the filter Images Stored in the HMU We demonstrate translation invariant correlation of images stored in a Holographic Memory Unit (HMU) using the VanderLugt architecture. Twenty three binary images of MiG-25 jet in different locations in the ® frame are stored via angle-multiplexing in the Memplex HMU. Scanning the angle of the read beam retrieves the stored images one at a time. Thin holographic filter contains a DC-suppressed Fourier transform of the MiG-25 jet. Correlation spot indicates the location of the plane in the frame. Superimposing the correlation spots produces a trajectory trace. Translation-invariant correlation of images stored via angle-multiplexing in a thick-holographic Memplex® material We demonstrate the quality of our holographic storage by presenting several captures of the images retrieved from the HMU. Sample images reconstructed from HMU Below are the traces of the MiG-25 jet produced when the SLM acts as the source of images and when the HMU is the source of images are compared. SLM as image source trace HMU as image source trace Sn P S is the fastest crystal for SPHRAM/JTC translation-invariant 2 2 6 correlation Structure of Sn P S . The unit cell Refractive indices and rotation 2 2 6 angle of the indicatrix is indicated by the dashed lines Joint transform correlation with Sn P S at 10KHz has been reported 2 2 6 Technology is available in Switzerland -- needs to be transferred to the U.S. R. Ryf, G. Montemezzani, P. Günter, A.A. Grabar, I.M. Stoika, and Yu. M. Vysochanskii, “High-frame- rate joint Fourier-transform correlator based on Sn P S crystal,” Opt. Lett. 26, 1666-1668 (2001) 2 2 6 Prism-coupled lenslet array is a crucial component of SPHRAM Must translate a spatial position in the transverse direction to a specific angle while maintaining the shape of the beam FFFooocccaaalll PPPlllaaannneee LLeennss HHHMMMUUU PPrriissmm--CCoouupplleedd LLeennss ff Prism-coupled LLA – single element Prism-coupled lenslet array Needs to be fabricated lithographically VVerterticical al DiDirecrectiotionn LLatateerralal DDiirreeccttiionon LaLatteerraall DDiirreecctitioonn LLatateerraall D Diirreeccttiioonn LLatateraleral DDiirrectectiionon OOvverviervieeww PPhhaassee CoCorrrreeccttioionn PPaarrtt FFooccuussiningg PPaarrtt PPhhaassee CCoorrrreecctitioonn PPaarrt t PPhhaassee C Coorrrreeccttiioonn P Parartt PPhahasse e CCorrorrectectiionon PPartart FFooccuussiinngg PPaarrtt •• FFoocuscusinging && PPhahassee CoCorrerrectctinging byby FFooccuussiinngg P Paarrtt FFocusocusiinng g PPaarrtt •••• papararabobolic lic proproffile ile plupluss lliineneaarr prprooffiillee (a) (b) (c) (d) (e) (f) •• •••• Vertical focusing and Lateral focusing and phase correction by a phase correction by a Lateral focusing plus different phase corrections multilayer structure physical surface profile
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