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Proceedings Paper

Photodarkening study of gratings written into rare-earth doped optical fibres using a femtosecond laser
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Paper Abstract

A well-known side-effect from fibre Bragg grating UV-fabrication is short wavelength attenuation, where irradiation with laser light, usually in the UV, generates both defect-induced absorption and scattering. These losses are especially problematic for high power optical fibre lasers operating at shorter wavelengths where resonant assisted coupling into the glass matrix through the rare earth ions can take place (e.g. Yb3+). In this, work we present a study of the relative magnitude of short wavelength attenuation in gratings written by the point-by-point method using a Ti-sapphire femtosecond laser operating at 800 nm. Such gratings are very stable and have been used as the feedback elements in fibre lasers with powers exceeding 100 W. We show that the scattering properties responsible for the attenuation are analogous to those associated with type II gratings written with UV lasers.

Paper Details

Date Published: 11 January 2008
PDF: 12 pages
Proc. SPIE 6800, Device and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV, 68000V (11 January 2008); doi: 10.1117/12.760829
Show Author Affiliations
Mattias L. Åslund, Univ. of Sydney (Australia)
Nemanja Jovanovic, Macquarie Univ. (Australia)
Nathaniel Groothoff, Univ. of Sydney (Australia)
John Canning, Univ. of Sydney (Australia)
Graham D. Marshall, Macquarie Univ. (Australia)
Stuart D. Jackson, Univ. of Sydney (Australia)
Alex Fuerbach, Macquarie Univ. (Australia)
Michael J. Withford, Macquarie Univ. (Australia)

Published in SPIE Proceedings Vol. 6800:
Device and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV
Hark Hoe Tan; Jung-Chih Chiao; Lorenzo Faraone; Chennupati Jagadish; Jim Williams; Alan R. Wilson, Editor(s)

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