Super-parallel Holographic Random Access Memory (SPHRAM) with a Joint Transform Correlator (JTC) Rotationally-variant simulation of MiG-25 jet movie Correlation spot tracking movie  SPHRAM/JTC is needed to quickly update filters in real-time to compensate for scale and rotation variance.  Already demonstrated rotationally-invariant translation-invariant correlation Rotationally-invariant movie of MiG-25 jet Experimental correlation spot tracking movie A. Heifetz, J.T. Shen, J.K. Lee, R. Tripathi, M.S. Shahriar, “Translation-Invariant Correlation of Images Stored via Holographic Angle- Multiplexing in a Memplex Volume Photopolymer Material,” submitted to Opt. Lett.

We propose to by-pass electronic recalling by using the SPHRAM-JTC architecture SHUTTER S2 SHUTTER S1 DYNAMIC HOLOGRAM CORRELATION BEAM FILTER IMAGE INPUT IMAGE FT LENS TARGET ID: 7968 REDIRECTOR IMAGING CCD RETRIEVED IMAGE FLATTENING BEAM EXPANDER APERTURE DEFLECTOR SHUTTER ARRAY HOLOGRAPHIC MUX/ DEMUX MEMORY UNIT REDUCING TELESCOPE READ LASER TARGET ID: 7968023 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 CCD Fourier- Transforming Lens Read Beam Thin Holographic DC-suppressed filter Image reconstructed from the filter Memplex® Holographic Memory Unit Recorded trace 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

Sn2P2S6 is the fastest crystal for SPHRAM/JTC translation-invariant correlation Refractive indices and rotation angle of the indicatrix Structure of Sn2P2S6. The unit cell is indicated by the dashed lines  Joint transform correlation with Sn2P2S6 at 10KHz has been reported 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 Sn2P2S6 crystal,” Opt. Lett. 26, 1666-1668 (2001)

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 Lens f Dq HMU Focal Plane Prism - Coupled Prism-coupled LLA – single element Prism-coupled lenslet array  Needs to be fabricated lithographically (a) (b) (c) (d) (e) (f) Focusing Part Phase Correction Part Lateral Direction Vertical focusing and phase correction by a multilayer structure Lateral focusing and phase correction by a physical surface profile Lateral focusing plus different phase corrections