Split-element liquid crystal tunable optical filter

Details Split-element liquid crystal tunable optical filter Split-element liquid crystal tunable optical filter

1996-06-11

2000-07-18

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

G02F 133

Patent

active

060914629

ABSTRACT:
This invention provides split-element liquid crystal polarization interference filters in wide-field, bandpass, cut-on, cut-off and notch filter embodiments. The split-element filters of this invention comprise a polarization interference stage defined by a pair of polarizers. Disposed within the stage are a center retarder, and first and a second split-element retarder, the split-element retarders having equal retardances and positioned in series with and on either side of the center retarder. The retarders can be liquid crystal variable retarders or can be fixed retarders used in combination with liquid crystal retarders. Double split-element filters in passive and tunable embodiments are provided comprising, within a polarization interference stage, a center retarder, an inside pair of split-element retarders and an outside pair of split-element retarders.

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