Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-04-23
1994-09-13
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 53, 359 93, G02F 1137
Patent
active
053473825
ABSTRACT:
A fast response liquid crystal optical retarder system. A liquid crystal retarder system employs one or more liquid crystal cells and corresponding drive circuits. The drive circuits provide to the cell a rectangular wave ac voltage signal whose RMS voltage is controlled. To switch from one retardance to another, the voltage is increased or decreased beyond the voltage corresponding to the target retardance and then, prior to or when the target retardance is reached, the applied voltage is switched to the voltage corresponding to the target retardance. One or more pairs of liquid crystal cells provided sequentially along the path of light propagation and with their eigen-axis orthogonal to one another to increase or decrease the total retardance rapidly. The retarder system is incorporated in a polarization control system and in a fiber-optic link.
REFERENCES:
patent: Re32521 (1987-10-01), Fergason
patent: 3558214 (1971-01-01), Lang et al.
patent: 3558215 (1971-01-01), Lang et al.
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 4017156 (1977-04-01), Moriyama et al.
patent: 4466702 (1984-08-01), Wiener-Avnear et al.
patent: 4566758 (1986-01-01), Bos
patent: 4595259 (1986-06-01), Pessegaux
patent: 4635051 (1987-01-01), Bos
patent: 4652087 (1987-03-01), Box et al.
patent: 4770500 (1988-09-01), Kalmanash et al.
patent: 4830468 (1989-05-01), Stephony et al.
patent: 4979235 (1990-12-01), Rumbaugh et al.
patent: 4991941 (1991-02-01), Kalmanash
patent: 5005952 (1991-04-01), Clark et al.
patent: 5014048 (1991-05-01), Knapp
patent: 5126864 (1992-06-01), Akiyama et al.
patent: 5187603 (1993-02-01), Bos
E. Kaneko "Liquid Crystal TV Displays", 1987 KTK Scientific Publishers.
Journal of Litewave Technology vol. 8, No. 3, Mar. 1990 Newport Corp. brochure on Liquid Crystal Light Control System.
Meadowlark Optics brochure on Liquid Crystal Variable Retarders Applied Optics pp. 2235-2239 vol. 19, No. 13, Jul. 1, 1990.
J. Appl. Phys. pp. 2029-2037 vol. 43, No. 5, May 1972.
J. of Litewave Tech. vol. Lt4, No. 3, pp. 360-363, Mar. 1986.
Parker Kenneth
Sikes William L.
LandOfFree
Liquid crystal cell retarder with driving beyond retardance valu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal cell retarder with driving beyond retardance valu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal cell retarder with driving beyond retardance valu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1124387