Athermal design of the optical tube assemblies for the ESO VLT Four Laser Guidestar Facility

Details Athermal design of the optical tube assemblies for the ESO VLT Four Laser Guidestar Facility Athermal design of the optical tube assemblies for the ESO VLT Four Laser Guidestar Facility

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.8336e..32h&link_type=abstract

Integrated Modeling of Complex Optomechanical Systems. Edited by Andersen, Torben; Enmark, Anita. Proceedings of the SPIE, Volu

Computer Science

Scientific paper

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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