Broadband Spatial Heterodyne Spectroscopy (shs) For Visible And Uv Interferometry Of Extended Targets

Details Broadband Spatial Heterodyne Spectroscopy (shs) For Visible And Uv Interferometry Of Extended Targets Broadband Spatial Heterodyne Spectroscopy (shs) For Visible And Uv Interferometry Of Extended Targets

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4907h&link_type=abstract

American Astronomical Society, DPS meeting #42, #49.07; Bulletin of the American Astronomical Society, Vol. 42, p.1003

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Scientific paper

In the study of faint, extended sources at high resolving power in visible and UV ranges, a Spatial Heterodyne Spectrometer (SHS) offers significant etendue advantages relative to conventional dispersive grating spectrometers and other interferometric techniques. A SHS is a compact two-beam interferometer that produces 2-D Fizeau fringe pattern from which the input spectrum can be obtained via a Fourier transform. In the basic SHS design a visble-UV bandpass instrument can provide a resolving power (R) 105 over a 0.5º field of view (FOV). The primary limitation comes from its narrow resolvable bandpass that is defined by the highest spatial frequency that can be sampled by the detector (typically 10Å). This limitation has made these instruments useful primarily for studies of single emission line features or molecular bands. However we are working on a Tunable Spatial Heterodyne Spectrometer (TSHS) design that enables slewing the acceptance band over a much broader spectral range. We describe here continuing progress toward development of an all-reflective TSHS prototype and some laboratory tests over extended targets. Our present effort involves a second-generation TSHS in which we address several technical limitations of an earlier version. In particular the new design reduces wavefront distortions on the pilot mirrors, solves problems with magnification and focus of the fringe localization plane onto the detector, and addresses the variability in sensitivity and resolving power limitations of using a single grating over a large bandpass by using a grating wheel.
Keywords: SHS, Interferometry, Faint diffuse sources, Spectroscopy, Ultraviolet, Remote sensing

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