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Advanced optical delay line demonstrator

Author: Dool, T.C. van den · Kamphues, F.G. · Fouss, B. · Henrioulle, K. · Hogenhuis, H.
Institution: Technisch Physische Dienst TNO - TH
Source:Lenstra, D.Morthier, G.Eeneux, T.Pessa, M., Semiconductor Lasers and Laser Dynamics, 27-30 April 2004, Strasbourg, France, 5495, 360-371
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 238130
Keywords: Active magnetic bearings · Advanced optical delay line · Aperture synthesis · DARWIN · GENIE · Nanopositioning · ODL · PRIMA · SiC mirrors · Actuators · Bearing capacity · Friction · Interferometry · Structural design · Wear of materials · Optical path difference (OPD)


TNO TPD, in cooperation with Micromega-Dynamics and Dutch Space, has designed an advanced Optical Delay Line (ODL) for use in future ground based and space interferometry missions. The work is performed under NIVR contract in preparation for GENIE and DARWIN. Using the ESO PRIMA DDL requirements as a baseline, the delay line can be used for PRIMA and GENIE without any modifications. The delay line design is modular and flexible, which makes scaling for other applications a relatively easy task. The ODL has a single linear motor actuator for Optical Path Difference (OPD) control, driving a two-mirror cat's eye with SiC mirrors and CFRP structure. Magnetic bearings provide frictionless and wear free operation with zero-hysteresis. The delay line is currently being assembled and will be subjected to a comprehensive test program in the second half of 2004.