Suppression of photo-darkening effect by Ca additive in Yb-doped silica glass fibre

S. Sugiyama; Y. Fujimoto; M. Murakami; H. Nakano; T. Sato; H. Shiraga

Suppression of photo-darkening effect by Ca additive in Yb-doped silica glass fibre

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Author(s): S. Sugiyama ¹ ; Y. Fujimoto ² ; M. Murakami ² ; H. Nakano ¹ ; T. Sato ³ ; H. Shiraga ²
- Affiliations: 1: Faculty of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashiosaka City, Osaka 577-8502, Japan;
  2: Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan;
  3: Research and Application Laboratory, Shin-Etsu Quartz Products Co. Ltd, 88 Kanaya-Kawakubo, Tamura, Koriyama, Fukushima 963-0725, Japan
Source: Volume 49, Issue 2, 17 January 2013, p. 148 – 149
DOI: 10.1049/el.2012.4267 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 07/12/2012, Published

It is found that Ca additive effectively suppresses the photo-darkening effect in Yb-doped silica fibre even at 6.0 wt% of high Yb₂O₃ concentration. Ca ion works as a stabiliser to maintain the Yb³⁺ valence state. It is hypothesised that this phenomenon may reflect the local charge balance effect in silica glass. This Yb-Ca co-doped silica fibre can be useful for high-power fibre lasers.

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