The Mark 2 Spatial Heterodyne Spectrometer, An All Reflection, Broadband SHS

Details The Mark 2 Spatial Heterodyne Spectrometer, An All Reflection, Broadband SHS The Mark 2 Spatial Heterodyne Spectrometer, An All Reflection, Broadband SHS

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21544110l&link_type=abstract

American Astronomical Society, AAS Meeting #215, #441.10; Bulletin of the American Astronomical Society, Vol. 42, p.402

Computer Science

Performance

Scientific paper

First operation of an all-reflection, broadband, Spatial Heterodyne Spectrometer (SHS) is reported. This Mark 2 SHS is constructed using a custom diffraction grating and other standard optical components. The custom grating is coarse (18 grooves/mm) with a symmetric blaze. It serves as a beam splitter and beam combiner of the Mark 2 SHS. The grating is combined with a plane mirror and a roof mirror to form a very stable ring interferometer which has been used successfully in earlier narrowband SHS designs. Fringes from the extra grating orders in the main blaze envelope are unexpectedly found to combine constructively with the desired primary fringes of the interferometer. Ambiguity between wavelengths above and below blaze in a given order, and order separation are demonstrated using cross tilt of the gratings to produce diagonal fringes. Coverage of a factor of four in wavelength in a single CCD frame is demonstrated. Other performance parameters and sample data are also presented. This research is supported under NASA Grant NNX08AQ09G.

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