Liquid crystal tuned birefringent filter

    公开(公告)号:IT1163337B

    公开(公告)日:1987-04-08

    申请号:IT2101983

    申请日:1983-05-10

    Inventor: KAYE WILBUR I

    Abstract: The filter includes a number of birefringent liquid crystal cells arranged in a stack, each of the cells including a zero-twist, nematic-phase liquid crystal material with a positive dielectric anisotropy and a polarizer between each cell and before and after the first and last cells, respectively, in the stack. A collimated beam of light is directed through the stack of cells and the emergent beam is utilized and detected. By the careful selection of the orders of the cells, the filter can be made highly transmissive at a single wavelength and can have a relatively high level of resolution and a low stray-light ratio. All of the cells can be electrically connected in parallel and the transmittance wavelength varied over a relatively wide range by the application of a voltage to each of the cells. One of the cells can be used as a modulator to alternately render the cell transmissive and opaque.

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