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Proceedings Paper

Commissioning the dual etalon Fabry-Perot modes of the Robert Stobie spectrograph on the Southern African Large Telescope
Author(s): T. B. Williams; E. Romero-Colmenero; P. Vaisanen; K. Browne; T. Makananise; A. Koeslag; C. Hettlage; E. Wiid; E. Simon; M. P. Smith; C. Pietraszewski
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Paper Abstract

The Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT) includes a Fabry-Pérot system that provides spectroscopic imaging over the 8 arcmin diameter science field of view, covering the wavelength range 430-860 nm with spectral resolutions ranging from 300 to10000 in four resolution modes. The higher resolution modes require the simultaneous use of two etalons. We discuss the complications encountered in implementing the dual etalon modes, the mechanical and operational solutions that have been devised, and the first science verification results. We also describe an efficient method for adjusting the parallelism of etalons in situ, and the use of the dual etalon system to determine the transmission of the individual etalons. The new dual etalon system was commissioned in late 2015 and is now producing useful scientific observations.

Paper Details

Date Published: 9 August 2016
PDF: 7 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99086N (9 August 2016); doi: 10.1117/12.2232674
Show Author Affiliations
T. B. Williams, South African Astronomical Observatory (South Africa)
E. Romero-Colmenero, South African Astronomical Observatory (South Africa)
P. Vaisanen, South African Astronomical Observatory (South Africa)
K. Browne, South African Astronomical Observatory (South Africa)
T. Makananise, South African Astronomical Observatory (South Africa)
A. Koeslag, South African Astronomical Observatory (South Africa)
C. Hettlage, South African Astronomical Observatory (South Africa)
E. Wiid, South African Astronomical Observatory (South Africa)
E. Simon, South African Astronomical Observatory (South Africa)
M. P. Smith, Univ. of Wisconsin-Madison (United States)
C. Pietraszewski, IC Optical Systems Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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