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Proceedings Paper

Demonstration and design of a compact diffraction limited spectrograph
Author(s): Christopher H. Betters; Sergio G. Leon-Saval; Joss Bland-Hawthorn; Gordon Robertson
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Paper Abstract

PIMMS IR is a prototype high resolution diraction limited spectrograph operating in the near infrared. Its current conguration has a bandwidth of 8nm centred on 1550nm with a resolving power, λ/Δλ, of 31000 with the option to increase this to ~60000 using a dual grating system. Remarkably, this is 85% of the theoretical limit for Gaussian illumination of a diraction grating. It is based upon the PIMMS#0 (photonic integrated multi-mode micro-spectrograph), a design that utilises the multi-mode to single-mode conversion of the photonic lantern. By feeding the spectrograph with the single-mode bres we are able to design and build a spectrograph whose performance is diraction limited and independent of the input source (i.e. a telescope) it is attached to. The spectrograph has with a throughput of ~70% (that is the light from the single-mode entrance slit that lands on the detector). The spectrograph is also extremely compact with a footprint of just 450mm x 190mm. Here we present the design of PIMMS IR and its performance characteristics determined from ray tracing, physical optics simulations and experimental measurements.Δ

Paper Details

Date Published: 24 September 2012
PDF: 9 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463H (24 September 2012); doi: 10.1117/12.925824
Show Author Affiliations
Christopher H. Betters, Institute of Photonics and Optical Science, The Univ. of Sydney (Australia)
Sydney Institute for Astronomy, The Univ. of Sydney (Australia)
Sergio G. Leon-Saval, Institute of Photonics and Optical Science, The Univ. of Sydney (Australia)
Joss Bland-Hawthorn, Institute of Photonics and Optical Science, The Univ. of Sydney (Australia)
Sydney Institute for Astronomy, The Univ. of Sydney (Australia)
Gordon Robertson, Sydney Institute for Astronomy, The Univ. of Sydney (Australia)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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