A Large Throughput High Resolution Fourier Transform Spectrometer for Submillimeter Applications

We have designed and constructed a Fourier Transform Spectrometer (FTS) for the study of submillimeter-wave mixers and optical components. The FTS has a large aperture (up to 25.4 cm) and small focal ratio (as fast as f/2.5) to achieve a large throughput. It operates in the 100-3750 GHz (3.3125 cm \Gamma1 ) frequency range with a resolution of up to 75 MHz (0.0025 cm \Gamma1 ). Here we discuss the design goals and provide a detailed description of the construction of the FTS. In addition, we highlight the variety of studies which have been conducted with this instrument, which include characterizing SIS mixers through both direct and heterodyne detection and measuring the properties of optical materials. keywords: Fourier Transform, spectroscopy, quasi-optics, heterodyne, SIS, dielectrics, submillimeterwaves, material properties 1 Presently at TeraDyne, 30801 Agoura Rd., Agoura Hills, CA 91301 2 Presently at JPL, Mail Stop 168-314, Pasadena, CA 91109 3 Presently at Bach Corpor..