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.
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 (Presented at SPIE Astronomical Telescopes + Instrumentation: June 14, 2018; Published: 9 July 2018); https://doi.org/10.1117/12.2313674.5807154463001.
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