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

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available