Liquid crystal tunable filters (LCTF) have been used in systems developed for Raman Chemical Imaging spectroscopy of
chemical, biological and explosives threat materials. However, an ongoing challenge in detecting trace levels of
materials is the limited throughput provided by previous generation LCTFs. In this article, we describe a new class of
birefringent LCTFs based on a Multi-Conjugate Filter design that provides high throughput over an extended wavelength
range (440 nm-750 nm). The spectral resolution, tuning accuracy, out-of-band rejection efficiency have been evaluated
and are demonstrated on a Raman chemical imaging microscope platform. Detection of trace threat particulate matter in
the presence of complex background with improved overall detection performance is demonstrated.