Solc filters in a reflective geometry

Abstract

We present the realization of a bulk optics birefringent Solc filter in a reflective geometry. This geometry reduces by half the number of required retarders, ensures the same spectral retardance function in pairs of retarders, and helps to make more compact filters. The key element is a quarter-wave Fresnel rhomb located in between the set of retarders and a mirror. Two cases are considered: the first Solc filter uses multiple-order quartz retarders, and the second one uses two liquid-crystal retarders. The latter has the advantage of being tunable via an applied voltage. Experimental results show how to filter the spectral content of a supercontinuum laser.

High Light Efficiency Spectral Polarization Imaging Method Based on Mach–Zehnder Structured Liquid Crystal Tunable Filters and Variable Retarders

“…A way to circumvent this issue is to optimize the optical configuration or insert additional narrow-band pass filters [22,23]. Messaadi et al [24] presented the realization of a bulk optics birefringent Solc filter in a reflective geometry, which reduces the number of filters as well as enhances the spectral resolution. Tam et al [25] proposed a novel design configuration of a double deformed helix ferroelectric liquid crystal (DHFLC) wave plate continuous tunable Lyot filter with a high-contrast ratio.…”