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 (https://doi.org/10.1515/pac-2019-0203)