VOLUME PHASE HOLOGRAM WITH LIQUID CRYSTAL IN MICROVOIDS BETWEEN FRINGES

• Main Authors: TROLL, MARK, A, INGWALL, RICHARD, T, WHITNEY, DUNCAN, H
• Format: Patent
• Language: English; French; German
• Published: 02.01.1992
• Subjects: CINEMATOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; ELECTROGRAPHY; FREQUENCY-CHANGING; HOLOGRAPHIC PROCESSES OR APPARATUS; HOLOGRAPHY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHOTOGRAPHY; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

L'invention concerne de hologrammes composites dans lesquels des microcavités entre les franges d'interférence holographiques sont remplies d'un cristal liquide. L'efficacité de diffraction et d'autres propriétés holographiques de tels hologrammes composites peuvent être modifiées par des stimulis externes, p.ex., l'application d'un champ électrique ou d'une énergie thermique. Composite holograms are disclosed wherein microvoids between the holographic interference fringes are filled with a liquid crystal. The diffraction efficiency and other holographic properties of such composite holograms may be varied by external stimuli, e.g., application of an electric field or thermal energy.