Tunable Birefringent Filters Using Liquid Crystal Elements
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Recent advances in liquid crystal technology have made it                       possible to construct tunable birefringent filters operating over               the range 3500-20000 Angstrom.  The center wavelength of these                  filters can be selected electronically, in a few milliseconds,                  with no moving parts.  These filters can have passbands as narrow               as 50 Angstroms and should be relatively inexpensive to produce.
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