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Proceedings Paper

Alignment-invariant mirror holder for cryogenic environment and its application to GIANO-TNG
Author(s): Iacopo Mochi; Carlo Baffa; Simone L. Donati; Gilberto Falcini; Sandro Gennari; Ernesto Oliva; Livia Origlia; Raffaele Tomelleri
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Paper Abstract

There are many ways to achieve the positioning accuracy established from tolerance in a cryogenic environment. One method is an opto-mechanical design which stays aligned at room temperature and at liquid nitrogen temperature without modifications. This could be achieved using aluminium mirrors with thermally matched aluminium holders and optical bench, that isotropically contract at cryogenic temperatures. The design of holders should allow some adjustment of the optics positions to correct possible errors in the manufacturing of the optical bench and/or optical holders themselves, without precluding the isotropic contraction during the cooling to the working temperature. This work illustrates the last prototype of cryogenic mirror-holder developed in our laboratory. The mirror mounting is based on a set of six forces which pull the mirror against the tree orthogonal faces of a reference corner. Adjustments to the mirror alignment can be achieved by means of six aluminium micrometers. Here we describe the device and illustrate the test results.

Paper Details

Date Published: 6 July 2006
PDF: 8 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62733N (6 July 2006); doi: 10.1117/12.670467
Show Author Affiliations
Iacopo Mochi, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Carlo Baffa, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Simone L. Donati, Univ. degli Studi di Firenze (Italy)
Gilberto Falcini, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Sandro Gennari, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Ernesto Oliva, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Telescopie Nazionale Galileo (Spain)
Livia Origlia, INAF, Osservatorio di Bologna (Italy)
Raffaele Tomelleri, Tomelleri s.r.l. (Italy)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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