A pyramid-based adaptive optics for the high-resolution echelle spectrograph at SAO RAS 6-m telescope

Eduard Muslimov; Gennadiy Valyavin; Vincent Chambouleyron; Felipe Pedreros Bustos; Idir Boudjema

doi:10.1117/12.2628692

29 August 2022 A pyramid-based adaptive optics for the high-resolution echelle spectrograph at SAO RAS 6-m telescope

Eduard Muslimov, Gennadiy Valyavin, Vincent Chambouleyron, Felipe Pedreros Bustos, Idir Boudjema

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218548 (2022) https://doi.org/10.1117/12.2628692
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We propose a design of an adaptive optics (AO) system for the high-resolution fiber-fed echelle spectrograph installed at the Nasmyth focus of the 6-m BTA telescope at the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences (RAS). The system will be based on a pyramid wavefront sensor and benefit from the experience of the Laboratoire d’Astrophysique de Marseille team in the field of adaptive optics. The AO will operate in the visible domain of 430-680 nm, in an f/30 input beam and provide correction for the on-axis source only. The main challenges in this particular design are insetting inserting the AO into an existing optical system and maintaining the focal and pupil planes configuration, fitting within the instrument’s flux budget as well as limitations on the total cost of the AO bench. According to the current design, the AO bench will use an additional relay consisting of 2 spherical mirrors to re-collimate the beam and project the pupil onto a small deformable mirror. A dichroic splitter will be used to longwave component to the pyramid wavefront sensor branch based on refractive optics only. Using off-the-shelf components only we can reach the instrumental wavefront error of 0.016 waves PTV with a 20 nm bandpass filter at 700 nm. Using folding mirrors and refocusing of the fiber’s microlens we restore the nominal geometry of the beam feeding the spectrograph. The final goal for the AO system is to increase the energy concentration in spot at the spectrograph’s entrance, and our preliminary modelling shows that we can gain by factor of 69.5 with the typical atmospheric conditions at SAO RAS.

Citation Download Citation

Eduard Muslimov, Gennadiy Valyavin, Vincent Chambouleyron, Felipe Pedreros Bustos, and Idir Boudjema "A pyramid-based adaptive optics for the high-resolution echelle spectrograph at SAO RAS 6-m telescope", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218548 (29 August 2022); https://doi.org/10.1117/12.2628692

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available