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Proceedings Paper

Opto-mechanical design and development status of an all spherical five lenses focal reducer for the 2.3 m Thai National Telescope
Author(s): Christophe Buisset; Apirat Prasit; Thierry Lépine; Saran Poshyachinda; Boonrucksar Soonthornthum; Alexis Deboos
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Paper Abstract

The National Astronomical Research Institute (NARIT) is currently developing an all spherical five lenses focal reducer to image a FOV circular of diameter Δθ = 14.6’ on the 4K camera with a pixel scale equal to 0.42’’/pixel. The spatial resolution will be better than 1.2’’ over the full visible spectral domain [400 nm, 800 nm]. The relative irradiance between the ghost and the science images will be lower than 10-4. The maximum distortion will be lower than 1% and the maximum angle of incidence on the filters will be equal to 8°. The focal reducer comprises 1 doublet L1 located at the fork entrance and 1 triplet L2 located in front of the camera. The doublet L1 will be mounted on a tip-tilt mount placed on a robotic sliding rail. L1 will thus be placed in the optical path during the observations with the 4K camera and will be removed during the observations with the other instruments. The triplet L2 will be installed on the instrument cube in front of the camera equipped with the filter wheel. The glass will be manufactured in a specialized company, the mechanical parts will be manufactured by using the NARIT Computer Numerical Control machine and the lenses will be integrated at NARIT. In this paper, we describe the optical and mechanical designs and we present the geometrical performance, the transmission budget and the results of the stray light analyses.

Paper Details

Date Published: 27 July 2016
PDF: 16 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99062F (27 July 2016); doi: 10.1117/12.2231168
Show Author Affiliations
Christophe Buisset, National Astronomical Research Institute of Thailand (Thailand)
Apirat Prasit, National Astronomical Research Institute of Thailand (Thailand)
Thierry Lépine, Institut d'Optique Graduate School (France)
Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
Saran Poshyachinda, National Astronomical Research Institute of Thailand (Thailand)
Boonrucksar Soonthornthum, National Astronomical Research Institute of Thailand (Thailand)
Alexis Deboos, National Astronomical Research Institute of Thailand (Thailand)
Institut d'Optique Graduate School (France)


Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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