Optical Design of the ARC Echelle Spectrometer
The high-dispersion spectrometer for the ARC 3.5-m telescope combines an echelle with prism cross-dispersion in an in-plane arrangement. This spectrometer will be located at an f/10 Nasmyth focus with an off-axis paraboloidal collimator and an f/2.7 Schmidt camera with achromatic corrector and CCD detector. In this paper we describe the optical layout and expected image characteristics of this instrument, with special attention given to the cross-dispersion arrangement and the achromatic Schmidt corrector.
KeywordsEntire Spectral Range Internal Transmittance Wedge Apex Camera Focal Length Order Separation
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