Stable mounting of beamsplitters for an interferometer |
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| Authors: | AA van Veggel H Nijmeijer |
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| Affiliation: | 1. Department of Mechanical Engineering, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands;2. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom;1. Reishauer AG, Wallisellen, Switzerland;2. Bremen Institute for Metrology, Automation and Quality Science (BIMAQ), University of Bremen, Germany;3. Department of Mechanical Engineering and Engineering Science, University of North Carolina at Charlotte, USA;1. University of North Carolina at Charlotte, USA;2. University of Bremen, Germany;3. Hexagon Manufacturing Intelligence, Germany;1. Physics Department and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Fredericton, NB E3B 5A3, Canada;2. Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France;3. Chemistry Department and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Fredericton, NB E3B 5A3, Canada;1. Department of Industrial Engineering and Mathematical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy;2. Department of Civil and Building Engineering, and Architecture, Polytechnic University of Marche, 60131 Ancona, Italy |
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| Abstract: | The Basic Angle Monitoring (BAM) system for satellite GAIA (2012–2018) will measure variation on the angle between the lines-of-sight between two telescopes with 2.5 prad uncertainty. It is a laser-interferometer system consisting of two optical benches with a number of mirrors and beamsplitters. The optical components need to be stable with respect to each other within 0.17 pm in position and 60 nrad in angle during measurements over a period of 6 h with 0.1 mK thermal stability. This paper aims at finding the most suitable mounting plane of the fused silica beamsplitters mounted onto the silicon carbide optical bench in the BAM system. These beamsplitters must be clamped mechanically. Based on a force stability analysis, mounting in the plane of light is a more stable solution than mounting on the reflective surface. However, when making a conceptual design the difficulty is making a design which has sufficient alignment stability to survive launch vibrations and a cool-down trajectory is more difficult. |
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