Output characteristics of a fibre Raman laser with a composite GeO₂ and P₂O₅-doped silica fibre

Jianqiu Xu Institute for Laser Sciences, University of Electro-Communications, 1-5-1 Chofugaoka, Chofushi, Tokyo, 182, Japan

M. Prabhu Institute for Laser Sciences, University of Electro-Communications, 1-5-1 Chofugaoka, Chofushi, Tokyo, 182, Japan

Cheng Li Institute for Laser Sciences, University of Electro-Communications, 1-5-1 Chofugaoka, Chofushi, Tokyo, 182, Japan

Jianren Lu Institute for Laser Sciences, University of Electro-Communications, 1-5-1 Chofugaoka, Chofushi, Tokyo, 182, Japan

Kenichi Ueda Institute for Laser Sciences, University of Electro-Communications, 1-5-1 Chofugaoka, Chofushi, Tokyo, 182, Japan

Abstract

A new type of fibre Raman laser composed of a GeO₂- and P₂O₅-doped silica fibre was investigated experimentally and theoretically. The output of the laser displays two difference characteristics depending on the type of fibre being used as the input end. Using the P₂O₅-doped fibre as the input end, the Raman Stokes line of 1320cm⁻¹ shift was enhanced by the latter GeO₂-doped fibre. While the GeO₂-doped fibre used as the input end, a wideband continuous spectrum was obtained. A model including effects of bandwidth of the Raman gain, four-wave mixing and the mutual influence of the GeO₂- and P₂O₅-doped silica fibre was constructed to illustrate the experimental observation.

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Output characteristics of a fibre Raman laser with a composite GeO₂ and P₂O₅-doped silica fibre

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Output characteristics of a fibre Raman laser with a composite GeO2 and P2O5-doped silica fibre

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Output characteristics of a fibre Raman laser with a composite GeO₂ and P₂O₅-doped silica fibre