MSE spectrograph optical design: A novel pupil slicing technique

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Proceedings titleProceedings of SPIE - The International Society for Optical Engineering
ConferenceGround-Based and Airborne Instrumentation for Astronomy V, 22 June 2014 through 26 June 2014
Article number91474D
SubjectAstronomy; Cameras; Glass; Infrared devices; Optical design; CFHT; High resolution; MSE; Multiobject spectroscopy; pupil-slicing; VPH gratings; Spectrographs
AbstractThe 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.
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AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275508
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Record identifierf7de1523-221b-4603-bdca-21a99b724baa
Record created2015-07-14
Record modified2016-05-09
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