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15 July 2010 The infrared imaging spectrograph (IRIS) for TMT: spectrograph design
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The Infra-Red Imaging Spectrograph (IRIS) is one of the three first light instruments for the Thirty Meter Telescope (TMT) and is the only one to directly sample the diffraction limit. The instrument consists of a parallel imager and offaxis Integral Field Spectrograph (IFS) for optimum use of the near infrared (0.84um-2.4um) Adaptive Optics corrected focal surface. We present an overview of the IRIS spectrograph that is designed to probe a range of scientific targets from the dynamics and morphology of high-z galaxies to studying the atmospheres and surfaces of solar system objects, the latter requiring a narrow field and high Strehl performance. The IRIS spectrograph is a hybrid system consisting of two state of the art IFS technologies providing four plate scales (4mas, 9mas, 25mas, 50mas spaxel sizes). We present the design of the unique hybrid system that combines the power of a lenslet spectrograph and image slicer spectrograph in a configuration where major hardware is shared. The result is a powerful yet economical solution to what would otherwise require two separate 30m-class instruments.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anna M. Moore, Brian J. Bauman, Elizabeth J. Barton, David Crampton, Alex Delacroix, James E. Larkin, Luc Simard, Ryuji Suzuki, and Shelley A. Wright "The infrared imaging spectrograph (IRIS) for TMT: spectrograph design", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352H (15 July 2010);

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