The design of an adaptive optics telescope : the case of DAG

Jolissaint L., Keskin O., Zago L., YERLİ S. K., YEŞİLYAPRAK C., MUDRY E., ...More

Conference on Ground-Based and Airborne Telescopes VI, Edinburgh, Saint Helena, 26 June - 01 July 2016, vol.9906 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 9906
  • Doi Number: 10.1117/12.2233297
  • City: Edinburgh
  • Country: Saint Helena
  • Keywords: DAG observatory, Ritchey-Chretien telescope, adaptive optics, active optics
  • Ataturk University Affiliated: Yes


In this paper, we describe in detail the optical design of DAG, a new 4 m telescope for Turkey. DAG is an "adaptive optics friendly" telescope, in a sense that each design decision is taken considering the potential impact on the AO performance (vibrations, static aberrations etc.) The objective is to make this telescope fully ready for AO at first light. It is designed as a Ritchey-Chretien combination, 56 m focal length, with Nasmyth foci only, and active optics. Its total RMS error is expected to be 45 nm up to Zernike mode 78, and 26 nm for the higher, non AO corrected modes. A final design optimization has been done by the telescope manufacturers, demonstrating that our AO-based requirements can be satisfied, without much difficulty.