Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-11-21
1995-12-19
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359100, G02F 1133, G02F 113
Patent
active
054773547
ABSTRACT:
A phase only spatial light modulating device for variably changing the phase of light passing through the device without changing the polarization of the light. Two analog state ferroelectric liquid crystal phase only spatial light modulators are placed such that their smectic layers are orthogonal to each other. The angle of the molecules in the two modulators is controlled to be at the same angle. Whereby light passing through both of the modulators obtains a phase delay for arbitrary polarized input light without amplitude modulation or change in polarization state.
REFERENCES:
patent: 5015074 (1991-05-01), Clerc et al.
patent: 5182665 (1993-01-01), O'Callaghan et al.
patent: 5347378 (1994-09-01), Handschy et al.
patent: 5381253 (1995-01-01), Sharp et al.
A. Sneh, J. Liu, & K. M. Johnson, "High-speed analog refractive-index modulator that uses a chiral smectic liquid crystal," pp. 305-307, Optics Letters, Feb. 15, 1994 vol. 19, No. 4.
G. D. Love, J. V. Major, & A. Purvis, "Liquid-crystal prisms for tip-tilt adaptive optics," pp. 1170-1172, Optics Letters, Aug. 1, 1994, vol. 19, No. 15.
Field Harry B.
Gross Anita Pellman
Kahm Steven E.
Malinowski Walter J.
Montanye George A.
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