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Proceedings Paper

Flexible manufacturing of large aspheres for VLT's Optical Tube Assemblies
Author(s): G. Gubbels; R. Henselmans; C. van Drunen
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Paper Abstract

For the ESO Very Large Telescope, TNO is making four Optical Tube Assemblies for the Four Laser Guide Star Facility. Each OTA is a large 20x Galilean beam expander, which expands a Ø15 mm, 25W CW 589 nm input laser beam to a steerable Ø300 mm output. The L2 lens is a Ø380 conical convex lens with a radius of curvature of 637 mm and conic constant k = -0.4776. This paper describes the flexible manufacturing technique that TNO applies to make these kind of optics. With the combination of deterministic polishing and the NANOMEFOS measurement machine, these optics can be manufactured quickly and efficiently, without the need for a dedicated test setup. Final performance testing of the OTA validates all the intermediate steps in the flexible process value chain.

Paper Details

Date Published: 27 September 2011
PDF: 9 pages
Proc. SPIE 8126, Optical Manufacturing and Testing IX, 81261D (27 September 2011); doi: 10.1117/12.893843
Show Author Affiliations
G. Gubbels, TNO (Netherlands)
R. Henselmans, TNO (Netherlands)
C. van Drunen, TNO (Netherlands)

Published in SPIE Proceedings Vol. 8126:
Optical Manufacturing and Testing IX
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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