Open AccessDesign and performance estimate of a focal reducer for the 23 m Thai National Telescope
Author(s) -
Christophe Buisset,
Alexis Deboos,
Thierry Lépine,
S. Poshyachinda,
Boonrucksar Soonthornthum
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.001416
Subject(s) - reducer , optics , telescope , focal length , lens (geology) , physics , angular resolution (graph drawing) , paraxial approximation , detector , mathematics , beam (structure) , combinatorics , thermodynamics
We have designed a new kind of focal reducer for the 2.3 m Thai National Telescope (TNT) to image the TNT specified FOV Δθ = 14.6' with an angular resolution α ≈1.2 arcsec. This, at a minimum cost by using common glasses, spherical surfaces and by requiring comfortable mechanical tolerance. This focal reducer comprises 1 lens placed at the level of the fork entrance and 1 lens placed in front of the detector. In this paper, we present the focal reducer paraxial model, we describe the optical design and we present the performance.