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Applied Optics

Applied Optics


  • Vol. 37, Iss. 16 — Jun. 1, 1998
  • pp: 3539–3546

Off-axis systems for 4-m class telescopes

Gilberto Moretto and Jeff R. Kuhn  »View Author Affiliations

Applied Optics, Vol. 37, Issue 16, pp. 3539-3546 (1998)

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We describe here an off-axis design for a 4.0-m astronomical telescope. We show that the geometric optical performance of this configuration can equal that of an on-axis conventional configuration while the diffractive performance fundamentally surpasses conventional telescopes because of the absence of pupil obstruction. The specific optical design described here uses a single off-axis primary mirror to obtain three distinct final focus ports: an f/10 port (with corrector) for wide-field imaging and spectroscopy with a field of view (FOV) of 15 arc min; a small-field, 2-reflection f/10 port suitable for polarimetry and coronagraphy; and a slower, f/16 (3-reflection) port with a 7 arc min FOV. For general astronomical observations requiring high optical throughput and low scattered light, this design is superior to conventional Ritchey–Chretien optical configurations.

© 1998 Optical Society of America

OCIS Codes
(120.1680) Instrumentation, measurement, and metrology : Collimation
(120.3620) Instrumentation, measurement, and metrology : Lens system design
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.4640) Instrumentation, measurement, and metrology : Optical instruments

Original Manuscript: September 10, 1997
Revised Manuscript: February 3, 1998
Published: June 1, 1998

Gilberto Moretto and Jeff R. Kuhn, "Off-axis systems for 4-m class telescopes," Appl. Opt. 37, 3539-3546 (1998)

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  1. J. H. Burge, “Applications of computer generated holograms for interferometric measurement of large aspheric optics,” in International Conference on Optical Fabrication and Testing, T. Kasai, ed., Proc. SPIE2576, 258–269 (1995). [CrossRef]
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  3. J. R. Kuhn, “SOAR-MSU astronomers report on scattered light,” MI-48823 (Michigan State University, East Lansing, Mich., 1997).
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