16 August 2000 Optical design for IRIS2: the AAT's next infrared spectrometer
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IRIS2 will provide direct imaging and low dispersion spectroscopy on the Anglo-Australian Telescope (AAT) using a 1K by 1K HgCdTe array and be capable of a future upgrade - by installing a new camera - to use a 2K by 2K array. It will be used primarily with the f/8 telescope configuration but can also be used with f/15 and f/36 configurations. The optics will be entirely transmissive with all spherical surfaces. The collimator will have four elements and the camera, five. With a 50mm collimated beam diameter and an f/2.2 camera, the 1K array will provide a field 7.6 arcmin square with pixels equivalent to 0.45 arcsec. If a 2K array is fitted later, an f/4 camera will give an 8.0 arcmin square field with pixels 0.24 arcsec square. Zemax was used to optimize the design as a multi-configuration system, so that a balance was maintained between direct imaging and spectroscopic performance and between the three atmospheric windows. For direct imaging with the f/2.2 camera, a diffraction based calculation indicates the energy inside a circle inscribed within one pixel is always better than 80 percent of that for a diffraction limited system. Particular care was taken to provide good imaging of the telescope pupil onto the cold stop in K.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter R. Gillingham, Peter R. Gillingham, Damien J. Jones, Damien J. Jones, } "Optical design for IRIS2: the AAT's next infrared spectrometer", Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395426; https://doi.org/10.1117/12.395426

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