
Proceedings Paper
MSE spectrograph optical design: a novel pupil slicing techniqueFormat | Member Price | Non-Member Price |
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Paper Abstract
The Maunakea Spectroscopic Explorer shall be mainly devoted to perform deep, wide-field, spectroscopic surveys at
spectral resolutions from ~2000 to ~20000, at visible and near-infrared wavelengths. Simultaneous spectral coverage at
low resolution is required, while at high resolution only selected windows can be covered. Moreover, very high
multiplexing (3200 objects) must be obtained at low resolution. At higher resolutions a decreased number of objects
(~800) can be observed. To meet such high demanding requirements, a fiber-fed multi-object spectrograph concept has
been designed by pupil-slicing the collimated beam, followed by multiple dispersive and camera optics. Different
resolution modes are obtained by introducing anamorphic lenslets in front of the fiber arrays. The spectrograph is able to
switch between three resolution modes (2000, 6500, 20000) by removing the anamorphic lenses and exchanging
gratings. Camera lenses are fixed in place to increase stability. To enhance throughput, VPH first-order gratings has been
preferred over echelle gratings. Moreover, throughput is kept high over all wavelength ranges by splitting light into more
arms by dichroic beamsplitters and optimizing efficiency for each channel by proper selection of glass materials,
coatings, and grating parameters.
Paper Details
Date Published: 8 July 2014
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91474D (8 July 2014); doi: 10.1117/12.2056894
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91474D (8 July 2014); doi: 10.1117/12.2056894
Show Author Affiliations
P. Spanò, NRC - Herzberg Institute of Astrophysics (Canada)
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
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