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Advanced Optical Technologies

Editor-in-Chief: Pfeffer, Michael


CiteScore 2018: 1.42

SCImago Journal Rank (SJR) 2018: 0.499
Source Normalized Impact per Paper (SNIP) 2018: 1.346

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2192-8584
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Volume 2, Issue 5-6

Issues

Alternative design for extremely large telescopes and options to use the VATT for ELT design demonstration

Mark R. Ackermann
  • Corresponding author
  • Department of Physics and Astronomy, University of New Mexico, 1919 Lomas NE, Albuquerque, NM 87131, USA
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  • Other articles by this author:
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/ John T. McGraw
  • Department of Physics and Astronomy, University of New Mexico, 1919 Lomas NE, Albuquerque, NM 87131, USA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Peter C. Zimmer
  • Department of Physics and Astronomy, University of New Mexico, 1919 Lomas NE, Albuquerque, NM 87131, USA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-09-27 | DOI: https://doi.org/10.1515/aot-2013-0043

Abstract

A variety of optical designs for extremely large telescopes (ELTs) can be found throughout the technical literature. Most feature very fast primary mirrors of either conic or spherical figure. For those designs with conic primary mirrors, many of the optical approaches tend to be derivatives of either the aplanatic Cassegrain or Gregorian systems. The Cassegrain approach is more common as it results in a shorter optical system, but it requires a large convex aspheric secondary mirror, which is extremely difficult and expensive to test. The Gregorian approach is physically longer and suffers from greater field curvature. In some design variations, additional mirrors are added to reimage and possibly flatten a Cassegrain focus. An interesting alternative ELT design uses a small Cassegrain system to image the collimated output of a Gregorian-Mersenne concentrator. Another alternative approach, currently in favor for use on the European ELT, uses three powered mirrors and two flat mirrors to reimage a Cassegrain focus out the side similar to a Nasmyth system. A preliminary examination suggests that a small, fast primary mirror, such as that used on the VATT, might be used for a subscale prototype of current ELT optical design options.

Keywords: extremely large telescopes; optical design; telescope; OCIS Classifications codes: 110.6770; 350.1260; 220.0220

References

About the article

Mark R. Ackermann

Mark Ackermann is an adjunct professor at the University of New Mexico, specializing in assisting graduate students and research groups with optical design problems. He earned a BS in Physics and Mathematics from the USAF Academy in 1981, an MS in Physics in 1983, and a PhD in Optics in 2002 from the University of New Mexico.

John T. McGraw

John McGraw is a professor at the University of New Mexico, Physics and Astronomy Department. He is a professional astronomer by training and currently leads the Measurement Astrophysics Research Group specializing in characterizing the atmosphere to enable better use of ground-based optical telescopes. John earned a BA in Physics from St. Olaf College in 1968, an MA in Astronomy from the University of Texas in 1973, and a PhD in Astronomy from the University of Texas in 1977.

Peter C. Zimmer

Pete Zimmer is a research professor at the University of New Mexico, Physics and Astronomy Department. His primary duties are leading the day-to-day research activities of undergraduate and graduate students supporting the Measurement Astrophysics Research Group. Pete earned a BS in Physics and Mathematics from St. Olaf College in 1995, an MS in Physics from the University of New Mexico in 1998, and a PhD in Physics from the University of New Mexico in 2004.


Corresponding author: Mark R. Ackermann, Department of Physics and Astronomy, University of New Mexico, 1919 Lomas NE, Albuquerque, NM 87131, USA, e-mail:


Received: 2013-07-16

Accepted: 2013-08-29

Published Online: 2013-09-27

Published in Print: 2013-12-01


Citation Information: Advanced Optical Technologies, Volume 2, Issue 5-6, Pages 423–432, ISSN (Online) 2192-8584, ISSN (Print) 2192-8576, DOI: https://doi.org/10.1515/aot-2013-0043.

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