Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1997-06-23
2000-10-03
Henry, Jon
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 22, G03H 112, G03H 126
Patent
active
061281093
ABSTRACT:
Apparatus is provided for the readout, and in certain applications the display, of information stored within incoherent/coherent double angularly multiplexed volume holographic optical elements. Such multiplexed volume holographic optical elements are based on parallel incoherent/coherent double angularly multiplexed volume holographic recording and readout principles, and are designed to exhibit maximum optical throughput efficiency and minimum crosstalk. Applications for this novel holographic readout apparatus, when used in conjunction with the aforementioned incoherent/coherent double angularly multiplexed volume holographic optical elements, include photonic interconnections for neural networks, telecommunications switching, and digital computing; optical information processors and optical memories; and optical display systems. The holographic readout apparatus is based primarily on the use of a spatially distributed source array, which contains a plurality of optical sources that are at once both individually coherent and mutually incoherent. The incorporation of the incoherent/coherent source array enables embodiments of the apparatus that in turn allow for incoherent superposition of reconstructed images and simplified parallel readout of the multiplexed volume holographic optical elements. The additional provision of spatial light modulation means allows for independent selection of the subset of stored holographically-encoded information patterns to be simultaneously read out or displayed. The holographic readout apparatus is capable of reading out and displaying information stored in several variants of incoherent/coherent double angularly multiplexed volume holographic optical elements, including those that are either optically recorded or computer generated, and that are based on either continuous-volume (bulk) or stratified-volume holographic media.
REFERENCES:
patent: 3985975 (1976-10-01), Steensma
patent: 4988153 (1991-01-01), Paek
patent: 5119214 (1992-06-01), Nishii et al.
patent: 5121228 (1992-06-01), Paek
patent: 5121231 (1992-06-01), Jenkins et al.
patent: 5129041 (1992-07-01), Pernick et al.
J.W. Goodman, "Fan-in and fan-out with optical interconnections", Optical Acta, vol. 32, pp. 1489-1496 (1985).
P. Asthana, "Volume Holographic Techniques for Highly Multiplexed Interconnection Applicantions", Ph.D. Dissertation, pp. 235-268, University of Southern California (1991), available from University Microfilms, Ann Arbor, MI.
J.L. Jewell et al, "Low threshold electrically-pumped vertical-cavity surface-emitting micro-lasers", Optics News, pp. 10-11 (Dec. 1989).
S. Piazzolla et al, "Single step copying process for multi-plexed volume holograms", Optics Letters, vol. 17, No. 9, pp. 676-678 (May 1, 1992).
R.A. Fisher, Optical Phase Conjugation, Academic Press, New York (1983), (copy not enclosed).
D.Z. Anderson, "Coherent optical eigen-state memory", Optics Letters, vol. 11, No. 1, pp. 58-68 (Jan. 1986).
R.V. Johnson et al, "Stratified volume holographic opti-cal elements", Optics Letters, vol. 13, No. 3, pp. 189-191 (Mar. 1988).
D. Psaltis et al, "Fractal Sampling Grids for Holographic Interconnections", Proc. SPIE, vol. 963, pp. 70-76 (1988).
A. Marrakchi, "Continuous coherent erasure of dynamic holographic interconnects in photorefractive crystals", Optics Letters, vol. 14, No. 6, pp. 326-328 (Mar. 15, 1989).
R.A. Athale, "Optical Matrix Algebraic Processors: A Survey", Proceedings of the Tenth International Optical Computing Conference, IEEE Catalog No. 83CH1880-4, pp. 24-31 (Apr. 1983).
E.G. Paek et al, "Compact and robust incoherent holographic correlator using a surface-emitting laser-diode array", Optics Letters, vol. 16, No. 12, pp. 937-939 (Jun. 15, 1991).
E.G. Paek et al, "Holographic associative memory for word-break recognition", Optics Letters, vol. 14, No. 4, pp. 205-207 (Feb. 15, 1989).
E.G. Paek et al, "Compact and ultrafast holographic memory using a surface-emitting microlaser diode array", Optics Letters, vol. 15, No. 6, pp. 341-343 (1990).
Jenkins B. Keith
Tanguay, Jr. Armand R.
Henry Jon
University of Southern California
LandOfFree
Apparatus for incoherent/coherent readout and display of informa does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for incoherent/coherent readout and display of informa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for incoherent/coherent readout and display of informa will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-201247