8 July 2014 LINC-NIRVANA: Diffraction limited optics in cryogenic environment
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Abstract
LINC-NIRVANA is an instrument combining the two 8.4 m telescopes of the Large Binocular Telescope (LBT) coherently, in order to achieve the optical resolution of the 23 meter baseline. For this interferometric instrument concept, the common beam combination requires diffraction limited optical performance. The optics, realized as a Cassegrain telescope design, consists of aluminum mirrors, designed and manufactured to fulfill the challenging specifications required for interferometric imaging. Due to the science wavelength range from 1 μm to 2.4 μm, covering the J, H and K band of the atmosphere, the complete beam combiner including the optics is operated in cryogenic environment at 60 Kelvin. Here, we demonstrate the verification of the optical performance at this temperature for classical in-coherent and coherent illumination. We outline the test setup and present the achieved results of wavefront error for the individual beams and fringe contrast for the interferometric point spread function. This paper continues the already presented integration of the interferometric camera with the focus on the performance of the cryogenic optics.
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Peter Bizenberger, Harald Baumeister, Patrick Fopp, Tom Herbst, Werner Laun, Lars Mohr, Javier Moreno-Ventas, "LINC-NIRVANA: Diffraction limited optics in cryogenic environment ", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91474B (8 July 2014); doi: 10.1117/12.2057473; https://doi.org/10.1117/12.2057473
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