Abstract

One of the new problems that has to be solved for segmented mirrors is related to periodic phasing, because for such mirrors to exhibit diffraction-limited performance the segments have to be positioned with an accuracy of a fraction of a wavelength. We describe the optical design of an instrument that measures the phasing errors (i.e., tip, tilt, and piston) between two segments under daylight conditions. Its design is based on a high-aperture white-light Michelson interferometer. It was developed at the Center for Sensors, Instruments and Systems Development (CD6) of the Technical University of Catalunya, Spain, and its final testing was carried out on the Gran Telescopio Canarias test workbench.

© 2002 Optical Society of America

Testing and applicability of the UPC-ZEBRA interferometer as a phasing system in segmented-mirror telescopes

Agustı́ Pintó, Ferran Laguarta, Roger Artigas, and Cristina Cadevall
Appl. Opt. 43(5) 1091-1096 (2004)

Phasing segmented mirrors: a modification of the Keck narrow-band technique and its application to extremely large telescopes

Achim Schumacher, Nicholas Devaney, and Luzma Montoya
Appl. Opt. 41(7) 1297-1307 (2002)

On-sky performance of the Zernike phase contrast sensor for the phasing of segmented telescopes

Isabelle Surdej, Natalia Yaitskova, and Frederic Gonte
Appl. Opt. 49(21) 4052-4062 (2010)

Dual-wavelength low-coherence instantaneous phase-shifting interferometer to measure the shape of a segmented mirror with subnanometer precision

Rainer Wilhelm, Bruno Luong, Alain Courteville, Sébastien Estival, Frédéric Gonté, and Nicolas Schuhler
Appl. Opt. 47(29) 5473-5491 (2008)

Fizeau interferometric cophasing of segmented mirrors

Anthony C. Cheetham, Peter G. Tuthill, Anand Sivaramakrishnan, and James P. Lloyd
Opt. Express 20(28) 29457-29471 (2012)