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Proceedings Paper

BIGRE: a new double microlens array for the integral field spectrograph of SPHERE
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Paper Abstract

IFS is the Integral Field Spectrograph for SPHERE, a 2nd generation instrument for VLT devoted to the search of exoplanets. To achieve the performances required for the IFS a new device sampling the focal plane has been designed, prototyped and tested in laboratory. This device named BIGRE consists of a system made of two microlens arrays with different focal lengths and thickness equal to the sum of them and precisely aligned each other. Moreover a mask has been deposited on the first array to produce a field stop for each lenslet. Laboratory tests confirmed that specifications and properties of the prototype are met by state of the art on optics microlens manufacturing. To characterize the device, a simulator of IFS has been built in laboratory and the BIGRE properties have been tested in real working conditions, showing that the design of the double array fulfills IFS requirements.

Paper Details

Date Published: 10 July 2008
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70143K (10 July 2008); doi: 10.1117/12.789354
Show Author Affiliations
E. Giro, INAF - Osservatorio Astronomico di Padova (Italy)
R. U. Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
J. Antichi, INAF - Osservatorio Astronomico di Padova (Italy)
P. Bruno, INAF - Osservatorio Astrofisico di Catania (Italy)
E. Cascone, INAF - Osservatorio Astronomico di Capodimonte (Italy)
V. De Caprio, INAF - IASF sezione di Milano (Italy)
S. Desidera, INAF - Osservatorio Astronomico di Padova (Italy)
R. G. Gratton, INAF - Osservatorio Astronomico di Padova (Italy)
D. Mesa, INAF - Osservatorio Astronomico di Padova (Italy)
S. Scuderi, INAF - Osservatorio Astrofisico di Catania (Italy)
M. Turatto, INAF - Osservatorio Astrofisico di Catania (Italy)
J. L. Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
K. Dohlen, Lab. d'Astrophysique de Marseille (France)
P. Puget, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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