Abstract To improve the performance of double clad high power fibre lasers, inner cladding design plays a significant role. A triangular inner cladding and silica structure second cladding with large air holes to acquire high inner cladding numerical aperture are designed. Single mode and high power output of the fibre lasers need the double clad Yb doped fibre with large core. A fibre with annular refractive index distribution core and low numerical aperture to acquire a large mode area fibre core is designed and fabricated. Furthermore co-doping with aluminium (Al) has been used to improve the solubility of ytterbium (Yb) into silicate network, and the core absorption coefficients of two Yb doped fibres are compared with different Al concentration experimentally.
Received: 04 March 2005
Revised: 30 May 2005
Accepted manuscript online:
Fund: Project supported by the project of National High Technology Research and Development Program of China (Grant Nos 2001AA312230 and 2004AA31g200).
Cite this article:
Fu Yong-Jun (傅永军), Jian Wei (简伟), Zheng Kai (郑凯), Yan Feng-Ping (延凤平), Chang De-Yuan (常德远), Jian Shui-Sheng (简水生) Design and fabrication of triangular inner cladding double-clad ytterbium doped fibre for high power lasers 2005 Chinese Physics 14 2338
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