An Ultra-Compact Static Fourier-Transform Spectrometer Based On A Single Birefringent Component

Abstract

The development of a static Fourier-transform spectrometer based on a single Wollaston prism, two polarizers and a compact 2D detector array is discussed. The Wollaston prism is of a modified configuration so that for an extended light source the interferogram fringes are localised just behind the exit face of the prism. This leads to an ultra-compact design for a Fourier-transform spectrometer (mounted within a 40 mm cube) that has a resolution of approximately 230 cm(-1) and an angular acceptance of +/-5 degrees.