Layer-oriented wavefront sensor for MAD: status and progress

Elise Vernet-Viard; Roberto Ragazzoni; Carmelo Arcidiacono; Andrea Baruffolo; Emiliano Diolaiti; Jacopo Farinato; Enrico Fedrigo; Enrico Marchetti; Renato Falomo; Simone Esposito; Marcel Carbillet; Christophe Verinaud

doi:10.1117/12.459036

7 February 2003 Layer-oriented wavefront sensor for MAD: status and progress report

Elise Vernet-Viard, Roberto Ragazzoni, Carmelo Arcidiacono, Andrea Baruffolo, Emiliano Diolaiti, Jacopo Farinato, Enrico Fedrigo, Enrico Marchetti, Renato Falomo, Simone Esposito, Marcel Carbillet, Christophe Verinaud

Author Affiliations +

Proceedings Volume 4839, Adaptive Optical System Technologies II; (2003) https://doi.org/10.1117/12.459036
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

A demonstrator of the multi-conjugate adaptive optics concept is under construction at ESO and will be installed on the Nasmyth focus of the VLT. This demonstrator called MAD will have two different wavefront sensor channels: Shack-Hartmann and Layer-Oriented; in this article we only describe the Layer-Oriented one. The Layer-Oriented wavefront sensor can select eight reference stars in the two arc-minutes corrected field of view in order to have a maximum of two references in each quarter of the field. XY stages will remotely adjust the position of each reference star selector. The starlight will be fed onto two detectors and two completely independent loops will drive the deformable mirrors, one conjugated to the ground and the other to an altitude of approximately 8 km. The Layer-Oriented wavefront sensor will use the same CCDs than the Shack-Hartmann channel and the pupil will be divided into 9×9 subapertures both for the high and for the ground layer. The spatial sampling of the subapertures will be different for the two CCDs and their integration time will be tuned to typical values of the conjugated altitudes characteristic wind speed. The overall status of the instrument with respect to optics, mechanics, electronics and software is given hereafter. We also summarize the progress on the procurement phase and give the time schedule for the assembling, integration and testing phases.

Citation Download Citation

Elise Vernet-Viard, Roberto Ragazzoni, Carmelo Arcidiacono, Andrea Baruffolo, Emiliano Diolaiti, Jacopo Farinato, Enrico Fedrigo, Enrico Marchetti, Renato Falomo, Simone Esposito, Marcel Carbillet, and Christophe Verinaud "Layer-oriented wavefront sensor for MAD: status and progress report", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); https://doi.org/10.1117/12.459036

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