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Proceedings Paper

Ion-assisted deposition processes for precision and laser optics
Author(s): Henrik Ehlers; Tobias Gross; Marc Lappschies; Detlev Ristau
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Paper Abstract

As a consequence of the ever increasing application field of modern optical technologies, new demands for the optimization of deposition processes for high quality optical coatings with increased environmental stability and power handling capability are imposed on thin film manufacturers. Starting from this challenge, the presented work is focused on the development of an ion assisted deposition (IAD) process using a cold cathode ion source. Especially in the mid infrared wavelength region (MIR) with its water absorption bands, the ion assisted deposition process leads to many practical advantages, e.g. for medical laser applications. In the present study, a cold cathode ion source was operated with pure oxygen for the deposition of different oxide materials. Besides the determination of the optical properties, the characterization of the thin films included the first application of an in situ optical broadband monitoring system during the IAD process. The produced single layers and MIR coatings are thermally stable, shift-free, and exhibit lower absorption compared to conventionally deposited coatings. In contrast to the conventional coatings, also no vacuum-to-air shift is observed for the realized MIR coatings. Therefore, the stable and reproducible IAD process in combination with the new process control strategies using the broadband transmittance measurements on the moving substrates allows an advanced process control and a precise determination of the layer thickness.

Paper Details

Date Published: 25 February 2004
PDF: 9 pages
Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); doi: 10.1117/12.514811
Show Author Affiliations
Henrik Ehlers, Laser Zentrum Hannover e.V. (Germany)
Tobias Gross, Laser Zentrum Hannover e.V. (Germany)
Marc Lappschies, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 5250:
Advances in Optical Thin Films
Claude Amra; Norbert Kaiser; H. Angus Macleod, Editor(s)

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