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22 September 2011 Optical design and test of the BIGRE-based IFS of SPHERE
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During the last months IFS, is the Integral Field Spectrograph for SPHERE, devoted to the search of exoplanets has been integrated in the clean room of Padova Observatory. The design of IFS is based on a new concept of double microlens array sampling the focal plane. 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, and a second mask is located on the intermediate pupil of the IFS to provide an aperture stop. After characterization of a previous prototype of BIGRE in the visible range, now the first measurements of the performances of the device in the IR range have been obtained on the instrument that will be mounted at the VLT telescope. These tests confirmed that specifications and properties of the prototype are met by state of the art on optics microlens manufacturing.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Claudi, E. Giro, U. Anselmi, D. Mesa, J. Antichi, R. Gratton, S. Desidera, V. De Caprio, L. Lessio, S. Scuderi, P. Bruno, D. Fantinel, B. Salasnich, E. Cascone, J. L. Beuzit, K. Dohlen, F. Wildi, P. Puget, M. Kasper, and N. Hubin "Optical design and test of the BIGRE-based IFS of SPHERE", Proc. SPIE 8167, Optical Design and Engineering IV, 81671S (22 September 2011);

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