Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1995-01-20
1996-08-20
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359497, 359501, 359303, 359296, G02F 113, G02F 1135, G02F 11335
Patent
active
055484271
ABSTRACT:
A switchable holographic device which includes a first polarizer having a spatially varying direction of polarization. The device also includes a liquid crystal device arranged to act as a controllable phase plate, the liquid crystal device having a predetermined phase shift in one state and substantially no birefringent activity in another state. The liquid crystal device is thus controllable to selectively alter the polarization of at least some of the radiation passing therethrough or to have substantially no optical activity. An output polarizer receives the radiation from the liquid crystal device so that, depending on the state of the liquid crystal device, the hologram is replayed or not replayed.
REFERENCES:
patent: 2647440 (1953-08-01), Rehorn
patent: 3437401 (1969-04-01), Siksai
patent: 3601469 (1971-08-01), Siksai
patent: 3825316 (1974-07-01), Amodei
patent: 4114990 (1978-09-01), Mash et al.
patent: 5020882 (1991-06-01), Makow
patent: 5121235 (1992-06-01), Matino et al.
patent: 5122890 (1992-06-01), Makow
patent: 5235449 (1993-08-01), Imazeki et al.
patent: 5243455 (1993-09-01), Johnson et al.
patent: 5327285 (1994-07-01), Faris
patent: 5381253 (1995-01-01), Sharp et al.
patent: 5434687 (1995-07-01), Kawata et al.
O'Brien et al, "Generalised Dynamic Holographic Interconnects Using Spatial Light Modulators," Mar. 1993, vol. 6, Technical Digest Series; OSA Meeting for Spatial Light Modulators and Applications.
Schadt et al, "Surface-Induced Parallel Alignment of Liquid Crystals by Linearly Polymerized Photopolymers", Jpn. J. Appl. Phys., vol. 31 (Jul. 1992) pp. 2155-2164.
Yakolev et al, "New Concept to Achieve Color LCD's with Linearly Photo-polymerized (LPP) LCD-Substrates," Aug.-Sep. 1993, SID. Euro Display '93, Strasbourg.
Optics Letters, vol. 18, No. 6, Mar. 15, 1993, Joseph E. Ford et al., "Polarization-Selective Computer-Generated Holograms", pp. 456-458.
Optical Computing, Palm Springs 1993, Technical Digest vol. 7, Opt. Soc. America, Mar. 1993, J. Ford et al., "Polarization-Selective Computer-Generated Holograms For Optical Multistage Interconnection Networks", pp. 258-261.
Optics Letters, vol. 16, No. 18, Sep. 15, 1991, Hirofumi Yamakazi et al., "4.times.4 Free-Space Optical Switching Using Real-Time Binary Phase-Only Holograms Generated By A Liquid-Crystal Display", pp. 1415-1417.
Optics Letters, vol. 17, No. 11, Jun. 1992, Masayuki Kato et al., "Multichannel Optical Switch That Uses Holograms", pp. 769-771.
Henry Jon W.
Sharp Kabushiki Kaisha
LandOfFree
Switchable holographic apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switchable holographic apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switchable holographic apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2334462