Day-time local phasing of neighbouring segments of the E-ELT primary mirror, based simultaneous multi-λ shearing interferometry
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.
- Publication:
-
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
- Pub Date:
- August 2016
- DOI:
- 10.1117/12.2235241
- Bibcode:
- 2016SPIE.9912E..4GL