10 November 2011 Athermal design of the optical tube assemblies for the ESO VLT Four Laser Guidestar Facility
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Proceedings Volume 8336, Integrated Modeling of Complex Optomechanical Systems; 83360X (2011) https://doi.org/10.1117/12.916127
Event: Integrated Modeling of Complex Optomechanical Systems, 2011, Kiruna, Sweden
Abstract
TNO is developing the Optical Tube Assemblies (OTAs) for the ESO VLT Four Laser Guide Star Facility. The OTAs are Galilean 20x beam expanders, expanding a (see manuscript)15 mm input beam to a steerable (see manuscript)300 mm output beam with a wavefront quality requirement of 50 nm rms. The allowed defocus under the influence of the changing environmental air temperature (0-15°C, -0.7°C/hr gradient) is only 0.2 waves. An integrated model of the thermal behavior has been made, combining optical, thermal lumped mass and FE analyses. This paper describes the athermal design and testing of the system.
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R. Henselmans, R. Henselmans, D. Nijkerk, D. Nijkerk, M. Lemmen, M. Lemmen, F. Kamphues, F. Kamphues, } "Athermal design of the optical tube assemblies for the ESO VLT Four Laser Guidestar Facility", Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360X (10 November 2011); doi: 10.1117/12.916127; https://doi.org/10.1117/12.916127
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