We show that room-temperature, crystalline quartz is a useful material for a beam splitter for spectroscopy in the far infrared, ~60-μm wavelength and longer. We compare such a beam splitter with the traditional far-infrared candidates: Mylar, polarizing, and lamellar beam splitters.
© 1997 Optical Society of America
John C. Brasunas, G. Mark Cushman, and B. Lakew, "Crystalline quartz as a far-infrared beam splitter for Fourier transform spectroscopy," Appl. Opt. 36, 2893-2896 (1997)