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

摘要

The KiwiSpec R4-100 is an advanced high resolution spectrograph developed by KiwiStar Optics, IndustrialResearch Ltd, New Zealand. The instrument is based around an R4 echelle grating and a 100mm collimated beamdiameter. The optical design employs a highly asymmetric white pupil design, whereby the transfer collimatorhas a focal length only 1/3 that of the primary collimator. This allows the cross-dispersers (VPH gratings) andcamera optics to be small and low cost while also ensuring a very compact instrument. The KiwiSpec instrumentwill be bre-fed and is designed to be contained in both thermal and/or vacuum enclosures. The instrumentconcept is highly exible in order to ensure that the same basic design can be used for a wide variety of sciencecases. Options include the possibility of splitting the wavelength coverage into 2 to 4 separate channels allowingeach channel to be highly optimized for maximum eciency. CCDs ranging from smaller than 2K2K to largerthan 4K4K can be accommodated. This allows good (3-4 pixel) sampling of resolving powers ranging frombelow 50,000 to greater than 100,000. Among the specic design options presented here will be a two-channelconcept 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 bepresented elsewhere in these proceedings.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.