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9 July 2018 The wide field optical spectrograph (WFOS) for TMT: fiber-WFOS optical design (Conference Presentation)
Renate Kupke, Hangxin Ji, Sriram Padmanaban Nadar, Devika Divakar, Luc Gilles
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Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070221 (2018) https://doi.org/10.1117/12.2313674
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States
Abstract
TMT’s wide field optical spectrograph is a multi-object, first-light instrument with broad continuous wavelength coverage (0.310 – 1.0 m) at a moderate spectral resolution of R = 5000. The international WFOS design team has recently completed the downselect of two design approaches: a slicer-based monolithic architecture and a fiber-based modular concept. We present here the end-to-end conceptual design for the fiber-based optical spectrograph. Included are the front-end focal reduction optics for coupling light into the fibers, the spectrograph collimator and camera optics, and the dispersive architecture for each color channel. The highly multiplexed fiber-WFOS presents a unique design challenge in keeping costs for the modular spectrographs low while maintaining performance gains afforded by the TMT, and in particular the TMT plus ground-layer adaptive optics (GLAO). A full performance analysis including predicted spectral resolution and throughput is presented for the design.
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Renate Kupke, Hangxin Ji, Sriram Padmanaban Nadar, Devika Divakar, and Luc Gilles "The wide field optical spectrograph (WFOS) for TMT: fiber-WFOS optical design (Conference Presentation)", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070221 (9 July 2018); https://doi.org/10.1117/12.2313674
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KEYWORDS
Spectrographs
Optical design
Channel projecting optics
Spectral resolution
Adaptive optics
Astronomical imaging
Cameras
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