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 
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                                  Prism-coupled LLA – single element                                                                                                                                                                                                                                                  Prism-coupled lenslet array 
                                                Needs to be fabricated lithographically
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     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