Split-element liquid crystal tunable optical filter

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