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10 July 2008 BIGRE: a new double microlens array for the integral field spectrograph of SPHERE
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Giro, R. U. Claudi, J. Antichi, P. Bruno, E. Cascone, V. De Caprio, S. Desidera, R. G. Gratton, D. Mesa, S. Scuderi, M. Turatto, J. L. Beuzit, K. Dohlen, and P. Puget "BIGRE: a new double microlens array for the integral field spectrograph of SPHERE", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70143K (10 July 2008);


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