Demonstration of an efficient, photonic-based astronomical spectrograph on an 8-m telescope
AffiliationUniv Arizona, Steward Observ
Univ Arizona, Coll Opt Sci
MetadataShow full item record
PublisherOPTICAL SOC AMER
CitationDemonstration of an efficient, photonic-based astronomical spectrograph on an 8-m telescope 2017, 25 (15):17753 Optics Express
Rights© 2017 Optical Society of America
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AbstractWe demonstrate for the first time an efficient, photonic-based astronomical spectrograph on the 8-m Subaru Telescope. An extreme adaptive optics system is combined with pupil apodiziation optics to efficiently inject light directly into a single-mode fiber, which feeds a compact cross-dispersed spectrograph based on array waveguide grating technology. The instrument currently offers a throughput of 5% from sky-to-detector which we outline could easily be upgraded to similar to 13% (assuming a coupling efficiency of 50%). The isolated spectrograph throughput from the single-mode fiber to detector was 42% at 1550 nm. The coupling efficiency into the single-mode fiber was limited by the achievable Strehl ratio on a given night. A coupling efficiency of 47% has been achieved with similar to 60% Strehl ratio on-sky to date. Improvements to the adaptive optics system will enable 90% Strehl ratio and a coupling of up to 67% eventually. This work demonstrates that the unique combination of advanced technologies enables the realization of a compact and highly efficient spectrograph, setting a precedent for future instrument design on very-large and extremely-large telescopes. (C) 2017 Optical Society of America
NoteOpen Access Journal.
VersionFinal published version
SponsorsJapan Society for the Promotion of Research [23340051, 26220704, 23103002]; Australian Research Council Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems [CE110001018]