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

Jolissaint, Laurent
Zago, Lorenzo
Yerli, Sinan Kaan
Mudry, Emeric
Lousberg, Gregory
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-Chr´etien 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.


Design of a derotator for the 4 in DAG telescope
Baudet, Jeremie; Jolissaint, Laurent; KESKİN, ONUR; YEŞİLYAPRAK, Cahit; Yerli, Sinan Kaan (2016-06-30)
This paper Silt our work on the design of a field derotator for the adaptive optics instruments platform of DAG (Dogu Anadolu Cozier vi), a new 4 in telescope for astronomical observations near the city of krzurum, l'urkey. While the telescopefollows an astronomical object, its pupil sees a rotation of the object around the optical axis which depends n the telescope geographic coordinate and the object sky coordinate. This effect is called the field rotation. This rotation needs to be compensated during the...
A Microwave Kinetic Inductance Detector for the DAG Telescope
GÜVER, Tolga; Mazin, Benjamin A.; O'Brien, Kieran; Kay, Burak; Alis, Sinan; Yelkenci, F. Korhan; YEŞİLYAPRAK, Cahit; Yerli, Sinan Kaan; Erol, Ayse; KESKİN, ONUR (2016-06-29)
We present the details of a proposed microwave kinetic inductance detector (MKID) for the DAG (Eastern Anatolia Observatory in Turkish) telescope, DAG-MKID. The observatory will have a modern 4m size telescope that is currently under construction. Current plan to obtain the first light with the telescope is late 2019. The proposed MKID based instrument will enable astronomers to simultaneously detect photons in the relatively wide wavelength range of 4000 - 13500 ˚A with a timing accuracy of µs and spectral...
Project Management of DAG: Eastern Anatolia Observatory
KESKİN, ONUR; YEŞİLYAPRAK, Cahit; Yerli, Sinan Kaan; Zago, Lorenzo; Guver, Tolga; Alis, Sinan (2016-06-28)
The four meter DAG (Eastern Anatolia Observatory in Turkish) telescope is not only the largest telescope in Turkey but also the most promising telescope in the northern hemisphere with a large potential to offer scientific observations with its cutting edge technology. DAG is designed to be an AO telescope which will allow both infrared and visible observations with its two Nasmyth platforms dedicated to next generation focal plane instruments. In this paper, status updates from DAG telescope will be presen...
Direct Reconstruction of Pharmacokinetic-Rate Images of Optical Fluorophores From NIR Measurements
Alacam, Burak; Yazici, Birsen (Institute of Electrical and Electronics Engineers (IEEE), 2009-09-01)
In this paper, we present a new method to form pharmacokinetic-rate images of optical fluorophores directly from near infra-red (NIR) boundary measurements. We first derive a mapping from spatially resolved pharmacokinetic rates to NIR boundary measurements by combining compartmental modeling with a diffusion based NIR photon propagation model. We express this mapping as a state-space equation. Next, we introduce a spatio-temporal prior model for the pharmacokinetic-rate images and combine it with the state...
The optical spectroscopic and photometric observations of the optical counterparts to the be/x-ray binary systems: gro j2058+42 and v0332+53
Özbey, Mehtap; Kızıloğlu, Ümit; Department of Physics (2008)
The spectroscopic and photometric observations of the optical counterparts to the Be/X-ray binary systems GRO J2058+42 and V0332+53 (BQ Cam), taken with RTT150 (Russian-Turkish 1.5 meter Telescope), are presented in this study. The distance, color and the reddening estimates for both sources, obtained via photometric observations, are consistent with the previous results. The results of our spectroscopic observations performed between May 2006 and June 2008 for optical counterpart to GRO J2058+42 indicate t...
Citation Formats
L. Jolissaint et al., “The design of an adaptive optics telescope : the case of DAG,” 2016, vol. 9906, Accessed: 00, 2020. [Online]. Available: