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Preparing the E-ELT M4 optical test

Journal
Date Issued
2015
Author(s)
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Tintori, M.
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Gallieni, D.
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Andrighettoni, M.
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Biasi, R.
Abstract
The design of the interferometric test of the adaptive M4 Unit of E-ELT, a deformable six petals 2.4 m mirror, will be described. The actual baseline follows a macro-stitching approach, where each segment is separately flattened and co-phased to the other petals. The optical test setup for the single shell consists in a Newtonian system, with a 1.5 m parabolic mirror as main collimator. A 0.6 m reference flat mirror is foreseen to verify the alignment of the interferometric cavity. A Demonstration Prototype of the final M4 Unit, a 222 actuators, two shells deformable mirror, has been produced by Microgate and A.D.S. International. Results of the optical measurement campaign performed in INAF on the prototype mirror are reported.
Volume
86
Start page
416
Uri
Url
Issn Identifier
0037-8720
Ads BibCode
2015MmSAI..86..416P
Rights
open.access
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