liquid crystal tunable filter 

Initialism: LCTF
https://doi.org/10.1351/goldbook.08266
Optical device based on polarization interference caused by transmission through a series of birefringent liquid crystal layers of different thicknesses that allow a narrow wavelength region to be selected and tuned over a broad spectral range.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 666 [Terms] [Paper]