22 July 2016 MEGARA: high-precision alignment system for gluing fibers and microlenses
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Abstract
MEGARA is the multi-object medium-resolution spectrograph for the GTC 10m telescope. MEGARA offers two observing modes, the LCB mode, a large central IFU; and a MOS mode composed by 92 robotic positioners carrying 7 fibers minibundles. Microlens are required to fit the GTC f/17 to the f/3 at the fiber entrance, where pupil image is oversized to have a fiber-to-fiber flux variation better than 10%. This tight requirement imposed manufacturing tolerances for the different components and required the development of a gluing station to provide a centering precision better than 5μm. We present the overview of the optical bundles, the gluing station and the final performance obtained during the integration and tests.
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A. Pérez-Calpena, E. Sánchez-Blanco, I. Martínez-Delgado, M. L. García-Vargas, X. Arrillaga, H. Aube, A. Gil de Paz, M. Maldonado, J. Gallego, J. Iglesias-Páramo, E. Carrasco, F. M. Sánchez-Moreno, J. Vilchez, R. Cedazo, "MEGARA: high-precision alignment system for gluing fibers and microlenses", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125L (22 July 2016); doi: 10.1117/12.2232620; https://doi.org/10.1117/12.2232620
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