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6 June 2019 Design study of an image slicer module for a multiobject spectrograph
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Abstract
We investigate an image slicer module for an optical multiobject spectrograph, wide-field optical spectrograph (WFOS), which is one of the first-light instruments of the Thirty Meter Telescope (TMT). The image slicer divides the target image into three slices, thus providing a one-third narrower slit width. By positioning a suite of such modules at the telescope focal surface, multiobject spectroscopy with high spectral resolution can be achieved. Three optical designs are developed: a two-mirror design, a four-mirror design, and a flat-mirror design. Comparing them, the flat-mirror design is found to be the most preferable for WFOS. From a tolerance analysis, the tolerances of manufacturing and assembling appear challenging but not insurmountable. We describe how the steep field curvature of TMT requires at least nine module variants, tuned to reduce defocus in specific focal surface zones. Finally, we introduce a viable mechanical packaging concept.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2019/$28.00 © 2019 SPIE
Shinobu Ozaki, Toshihiro Tsuzuki, Yoshiyuki Obuchi, Bungo Ikenoue, Satoshi Miyazaki, Jason R. Fucik, Kevin A. Bundy, and Maureen Savage "Design study of an image slicer module for a multiobject spectrograph," Journal of Astronomical Telescopes, Instruments, and Systems 5(3), 035001 (6 June 2019). https://doi.org/10.1117/1.JATIS.5.3.035001
Received: 18 January 2019; Accepted: 8 May 2019; Published: 6 June 2019
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