Demonstration and design of a compact diffraction limited spectrograph

Christopher H. Betters; Sergio G. Leon-Saval; Joss Bland-Hawthorn; Gordon Robertson

doi:10.1117/12.925824

24 September 2012 Demonstration and design of a compact diffraction limited spectrograph

Christopher H. Betters, Sergio G. Leon-Saval, Joss Bland-Hawthorn, Gordon Robertson

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84463H (2012) https://doi.org/10.1117/12.925824
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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

Citation Download Citation

Christopher H. Betters, Sergio G. Leon-Saval, Joss Bland-Hawthorn, and Gordon Robertson "Demonstration and design of a compact diffraction limited spectrograph", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463H (24 September 2012); https://doi.org/10.1117/12.925824

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