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

Mattias Aslund, Nemanja Jovanovic, Nathaniel Groothoff, John Canning, Graham Marshall, Stuart D. Jackson, Alexander Fuerbach, Michael Withford

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

7 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationDevice and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV
EditorsHark Hoe Tan, Jung-Chih Chiao, Lorenzo Faraone, Chennupati Jagadish, Jim Williams, Alan R. Wilson
Place of PublicationPiscataway, NJ
PublisherSPIE
Number of pages12
ISBN (Print)9780819469717
DOIs
Publication statusPublished - 2008
EventDevice and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV - Canberra, Australia
Duration: 5 Dec 20077 Dec 2007

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume6800

Other

OtherDevice and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV
CountryAustralia
CityCanberra
Period5/12/077/12/07

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Keywords

  • Femtosecond lasers
  • Fibre bragg gratings
  • Fibre lasers
  • Photo-darkening

Cite this

Aslund, M., Jovanovic, N., Groothoff, N., Canning, J., Marshall, G., Jackson, S. D., ... Withford, M. (2008). Photodarkening study of gratings written into rare-earth doped optical fibres using a femtosecond laser. In H. H. Tan, J-C. Chiao, L. Faraone, C. Jagadish, J. Williams, & A. R. Wilson (Eds.), Device and Process Technologies for Microelectronics, MEMS, Photonics, and Nanotechnology IV [68000V] (Proceedings of SPIE; Vol. 6800). Piscataway, NJ: SPIE. https://doi.org/10.1117/12.760829