Spatial heterodyne spectroscopy: a novel interferometric technique for ground-based and space astronomy

John M. Harlander; Fred L. Roesler

doi:10.1117/12.19125

1 July 1990 Spatial heterodyne spectroscopy: a novel interferometric technique for ground-based and space astronomy

John M. Harlander, Fred L. Roesler

Proceedings Volume 1235, Instrumentation in Astronomy VII; (1990) https://doi.org/10.1117/12.19125
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

The theoretical principles and technical feasibility of spatial heterodyne spectroscopy (SHS) for astronomical observations are explored. The SHS setup is basically a Michelson interferometer with the mirrors replaced by diffraction gratings; wavelength-dependent Fizeau fringes are recorded and Fourier analyzed to obtain a high-resolution spectrum even at relatively low spatial frequencies. Two all-reflection SHS instruments are described and illustrated with diagrams, and laboratory test results using CCD detectors for both visible and UV measurements are presented, indicating resolving powers of about 75,000 and 70,000, respectively. Also discussed are the advantages and limitations of SHS vis a vis other Fourier-transform spectroscopic methods.

Citation Download Citation

John M. Harlander and Fred L. Roesler "Spatial heterodyne spectroscopy: a novel interferometric technique for ground-based and space astronomy", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); https://doi.org/10.1117/12.19125

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