Share Email Print
cover

Proceedings Paper

Optical design for a 1-deg. FOV 30-m telescope
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We are exploring the feasibility of a very large telescope with a wide field of view for multi-object spectroscopic surveys. This paper presents a brief overview of the scientific need for such facility, a possible optical design for such a telescope, and a description of how such a telescope might function for both wide-field, seeing-limited spectroscopy and narrow-field, high-Strehl imaging and spectroscopy. The science is primarily driven by the fact that imaging surveys are now capable of cataloguing vast numbers of targets that would take a formidable amount of time on currently existing telescopes for spectroscopic followup. The telescope design, a 4-mirror extension of the Paul concept, is a 30-meter telescope that delivers a full 1 degree(s) field at f/4 with excellent image performance across the full field. The primary is an f/1, 30-meter. The secondary has a diameter of 5.3-meters and contains a pure conic surface that delivers an uncorrected focus between the primary and secondary. The tertiary mirror is located at the vertex of the primary and has a diameter of about 10.6- meters. The quaternary mirror, located at the position of the initial focus, is about 4.4-meters and images the final focus back at the vertex of the tertiary mirror. The initial design had both the tertiary and quaternary mirrors with high-order, even aspheric surfaces. Further study has led to a simplification of the design in which the tertiary is now a pure conic like the primary and secondary mirrors, and the quaternary mirror is something like a Schmidt corrector with only modest fourth and sixth order terms.

Paper Details

Date Published: 2 August 2000
PDF: 8 pages
Proc. SPIE 4004, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning, (2 August 2000); doi: 10.1117/12.393944
Show Author Affiliations
Samuel Charles Barden, National Optical Astronomy Observatories (United States)
Charles F. W. Harmer, National Optical Astronomy Observatories (United States)
Charles F. Claver, National Optical Astronomy Observatories (United States)
Arjun Dey, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 4004:
Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning
Thomas A. Sebring; Torben Andersen, Editor(s)

© SPIE. Terms of Use
Back to Top