KiwiSpec - an advanced spectrograph for high resolution spectroscopy: optical design and variations

Stuart I. Barnes; Steve Gibson; Kathryn Nield; Dave Cochrane

doi:10.1117/12.926527

24 September 2012 KiwiSpec - an advanced spectrograph for high resolution spectroscopy: optical design and variations

Stuart I. Barnes, Steve Gibson, Kathryn Nield, Dave Cochrane

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 844688 (2012) https://doi.org/10.1117/12.926527
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The KiwiSpec R4-100 is an advanced high resolution spectrograph developed by KiwiStar Optics, Industrial Research Ltd, New Zealand. The instrument is based around an R4 echelle grating and a 100mm collimated beam diameter. The optical design employs a highly asymmetric white pupil design, whereby the transfer collimator has a focal length only 1/3 that of the primary collimator. This allows the cross-dispersers (VPH gratings) and camera optics to be small and low cost while also ensuring a very compact instrument. The KiwiSpec instrument will be bre-fed and is designed to be contained in both thermal and/or vacuum enclosures. The instrument concept is highly exible in order to ensure that the same basic design can be used for a wide variety of science cases. Options include the possibility of splitting the wavelength coverage into 2 to 4 separate channels allowing each channel to be highly optimized for maximum eciency. CCDs ranging from smaller than 2K2K to larger than 4K4K can be accommodated. This allows good (3-4 pixel) sampling of resolving powers ranging from below 50,000 to greater than 100,000. Among the specic design options presented here will be a two-channel concept optimized for precision radial velocities, and a four-channel concept developed for the Gemini High- Resolution Optical Spectrograph (GHOST). The design and performance of a single-channel prototype will be presented elsewhere in these proceedings.

Citation Download Citation

Stuart I. Barnes, Steve Gibson, Kathryn Nield, and Dave Cochrane "KiwiSpec - an advanced spectrograph for high resolution spectroscopy: optical design and variations", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844688 (24 September 2012); https://doi.org/10.1117/12.926527

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