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Proceedings Paper • Open Access

High reproducible Co2 laser spliced fiber-collimator for a space borne laser system
Author(s): S. Böhme; S. Fabian; A. Kamm; T. Peschel; E. Beckert; A. Tünnermann; K. Nicklaus; M. Dehne

Paper Abstract

The Gravity Recovery and Climate Experiment Follow-On (GRACE FO) is a space borne mission to map variations in the earth’s gravity field with an even greater accuracy than the first GRACE mission. GRACE FO is a collaborative project of NASA (USA) and GFZ (Germany) scheduled for launch in 2017. On GRACE the gravity field is reconstructed from a measurement of the distance variation between two satellites following each other in 200 km distance by use of a microwave ranging instrument. On GRACE FO a laser ranging interferometer (LRI) is added as a demonstrator in addition to the microwave. Moving from microwave range to optical wavelengths provides an improvement in distance measurement noise from some μm/√Hz to 80 nm/√Hz down to 0.01 Hz frequency. The criteria on the beam delivery system are demanding, in particular with respect to laser beam quality, wave front deviation and pointing as well as thermal and mechanical stability. Conventionally such a system can be manufactured with at least two special mounted lenses or an aspheric lens aligned with respect to the fiber end. However, the alignment of this optical system must be maintained throughout the mission, including the critical launch phase and a wide temperature range in orbit, leading to high alignment effort and athermal design requirements. The monolithic fiber-collimator presented here provides excellent optical and thermal and mechanical performance. It is a part of the LRI and located on the Optical Bench Assembly (OBA) which has already been described in [1, 3].

Paper Details

Date Published: 25 September 2017
PDF: 6 pages
Proc. SPIE 10562, International Conference on Space Optics — ICSO 2016, 105625W (25 September 2017); doi: 10.1117/12.2296211
Show Author Affiliations
S. Böhme, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
S. Fabian, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
A. Kamm, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
T. Peschel, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
E. Beckert, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
A. Tünnermann, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
K. Nicklaus, SpaceTech GmbH (Germany)
M. Dehne, SpaceTech GmbH (Germany)


Published in SPIE Proceedings Vol. 10562:
International Conference on Space Optics — ICSO 2016
Bruno Cugny; Nikos Karafolas; Zoran Sodnik, Editor(s)

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