Day-time local phasing of neighbouring segments of the E-ELT primary mirror, based simultaneous multi-λ shearing interferometry

S. Leveque; C. Falldorf; R. Klattenhoff; A. Cheffot

doi:10.1117/12.2235241

29 August 2016 Day-time local phasing of neighbouring segments of the E-ELT primary mirror, based simultaneous multi-λ shearing interferometry

S. Leveque, C. Falldorf, R. Klattenhoff, A. Cheffot

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99124G (2016) https://doi.org/10.1117/12.2235241
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

In the context of the segmented primary mirror of the E-ELT, the ability to measure the phasing state of neighbouring segments during day-time represents a way to mitigate the risk of potentially time consuming on-sky phasing after segment replacement. This paper presents the concept of a local phasing sensor based on simultaneous multi-wavelength shearing interferometry, as well as experimental results obtained on the ESO M1 test facility.

Citation Download Citation

S. Leveque, C. Falldorf, R. Klattenhoff, and A. Cheffot "Day-time local phasing of neighbouring segments of the E-ELT primary mirror, based simultaneous multi-λ shearing interferometry", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99124G (29 August 2016); https://doi.org/10.1117/12.2235241

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