22 July 2016 NFIRAOS beamsplitters subsystems optomechanical design
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Abstract
The early-light facility adaptive optics system for the Thirty Meter Telescope (TMT) is the Narrow-Field InfraRed Adaptive Optics System (NFIRAOS). The science beam splitter changer mechanism and the visible light beam splitter are subsystems of NFIRAOS. This paper presents the opto-mechanical design of the NFIRAOS beam splitters subsystems (NBS). In addition to the modal and the structural analyses, the beam splitters surface deformations are computed considering the environmental constraints during operation. Surface deformations are fit to Zernike polynomials using SigFit software. Rigid body motion as well as residual RMS and peak-to-valley surface deformations are calculated. Finally, deformed surfaces are exported to Zemax to evaluate the transmitted and reflected wave front error. The simulation results of this integrated opto-mechanical analysis have shown compliance with all optical requirements.
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Frédéric Lamontagne, Nichola Desnoyers, Reston Nash, Marc-André Boucher, Olivier Martin, Louis Buteau-Vaillancourt, François Châteauneuf, Jenny Atwood, Alexis Hill, Peter W. G. Byrnes, Glen Herriot, Jean-Pierre Véran, "NFIRAOS beamsplitters subsystems optomechanical design", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991205 (22 July 2016); doi: 10.1117/12.2233310; https://doi.org/10.1117/12.2233310
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