A laboratory prototype spectral-spatial interferometer has been constructed to demonstrate the feasibility of the double-Fourier technique at far infrared (FIR) wavelengths (0.15–1 THz). It is planned to use this demonstrator to investigate and validate important design features and data-processing methods for future astronomical FIR interferometer instruments. In building this prototype, we have had to address several key technologies to provide an end–end system demonstration of this double-Fourier interferometer. We report on the first results taken when viewing single-slit and double-slit sources at the focus of a large collimator used to simulate real sources at infinity. The performance of the prototype instrument for these specific field geometries is analyzed to compare with the observed interferometric fringes and to demonstrate image reconstruction capabilities.
© 2012 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: December 22, 2011
Revised Manuscript: March 7, 2012
Manuscript Accepted: March 9, 2012
Published: April 20, 2012
William F. Grainger, Roser Juanola-Parramon, Peter A. R. Ade, Matt Griffin, Flo Liggins, Enzo Pascale, Giorgio Savini, and Bruce Swinyard, "Demonstration of spectral and spatial interferometry at THz frequencies," Appl. Opt. 51, 2202-2211 (2012)