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Proceedings Paper

Antireflective coatings on optical fibers for high-power solid state lasers
Author(s): Manfred Dieckmann; Uwe Willamowski; Detlev Ristau; Herbert Welling; Bernhard Steiger; J. Franke; Reinhard Wolf
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Paper Abstract

This paper presents investigations to improve the quality of high power antireflective coatings for optical fibers used in material processing with Nd:YAG lasers. The coatings were produced by electron-beam deposition and ion-beam-sputtering on step-index, multimode fibers with a core diameter of 1000 micrometers . The reflection losses, the absorption, and the laser-induced damage thresholds of these coatings were determined. Hafnia, tantala, and silica were selected as deposition materials for the AR-coatings. For measuring the reflection losses of the coated fiber surfaces, a diode-pumped Nd:YAG laser was used. Absorption measurements were performed by photothermal displacement spectroscopy, a surface sensitive technique which makes scanning of the fiber surface possible. These data were compared to calorimetric values determined from quartz substrates which were deposited in the same coating run. The R-on-1 damage thresholds of the coated fibers were measured using a two- stage single-mode Nd:YAG laser with a pulse duration of 12 ns. A four-stage cw system with 1.2 kW output power and a pulsed Nd:YAG slab laser were used to evaluate the performance of the coated fibers.

Paper Details

Date Published: 24 June 1993
PDF: 16 pages
Proc. SPIE 1848, 24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992, (24 June 1993); doi: 10.1117/12.147435
Show Author Affiliations
Manfred Dieckmann, Laser-Zentrum Hannover e.V. (Germany)
Uwe Willamowski, Laser-Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser-Zentrum Hannover e.V. (Germany)
Herbert Welling, Laser Zentrum Hannover eV (Germany)
Bernhard Steiger, Hochschule fuer Technik und Wirtschaft Mittweida (Germany)
J. Franke, Hochschule fuer Technik und Wirtschaft Mittweida (Germany)
Reinhard Wolf, Hochschule fuer Technik und Wirtschaft Mittweida (Germany)

Published in SPIE Proceedings Vol. 1848:
24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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