LCTFs circa 2014 with integrated circuitry for control and power (left), or an older model with a separate electronics controller box and thick, shielded cable (right).
A liquid crystal tunable filter (LCTF) is an optical filter that uses electronically controlled liquid crystal (LC) elements to transmit a selectable wavelength of light and exclude others. Often, the basic working principle is based on the Lyot filter but many other designs can be used.[1] The main difference with the original Lyot filter is that the fixed wave plates are replaced by switchable liquid crystal wave plates.
^Beeckman, J; Neyts, K & Vanbrabant, P (2011). "Liquid-Crystal Photonic Applications". Optical Engineering. 50 (81202): 081202–081202–17. Bibcode:2011OptEn..50h1202B. doi:10.1117/1.3565046. hdl:1854/LU-1265564.
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