Statistics – Applications
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8515h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #85.15; Bulletin of the American Astronomical Society, V
Statistics
Applications
Scientific paper
All-reflective spatial heterodyne spectrometers (SHS) are a form of common-path interferometer that combine large étendue and high spectral resolution in a compact package that can be easily incorporated into variety of ground and space based optical systems. SHS works by splitting incoming light, introducing an anti-symmetric wavelength dependent rotation in the wavefronts of each of the two beams, and then recombining them at an output where interference produces a 2 dimensional pattern of fringes with a power-spectrum set by the distribution of frequencies in the source. These instruments recover the full theoretical resolving power of the illuminated grating-width, which gives them very high spectral resolution without the limitations on field of view imposed by aperture re-imaging in grating spectrographs. This wide input acceptance angle makes them ideal for the study of extended, low surface brightness targets. The primary limitation of SHS technology is that the bandpass available for sampling is limited by the spectral resolution and the number of frequencies the detector system can resolve. For typical applications this restriction limits the bandpass for a single tune to a range of 1-10 nm, which has limited them previously to applications calling for observations of single, targeted spectral features. We report here on our progress in developing a Tunable SHS that can dynamically realign its tuning wavelength, thereby translating its 1-10 nm bandpass across a range in wavelength from 300-700nm.
Dawson Olivia
Giersch L.
Harris Walter M.
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