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Q-Switched Large-Mode-Area Yb-Doped Fibre Laser Using GaAs as Saturable Absorber |
| FU Sheng-Gui;GUO Zhan-Cheng;SI Li-Bin;ZHAO Ying;YUAN Shu-Zhong;DONG Xiao-Yi |
| College of Information Technology Science, Nankai University, Tianjin 300071 |
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| Cite this article: |
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FU Sheng-Gui, GUO Zhan-Cheng, SI Li-Bin et al 2007 Chin. Phys. Lett. 24 1264-1266 |
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Abstract A passive Q-switched large-mode-area Yb-doped fibre laser is demonstrated using a GaAs wafer as the saturable absorber. A high Yb doping concentration double-clad fibre with a core diameter of 30μm and a numerical aperture of 0.07 is used to increase the laser gain volume, permitting greater energy storage and higher output power than conventional fibres. The maximum average output power is 7.2W at 1080nm wavelength, with the shortest pulse duration of 580ns and the highest peak power of 161W when the laser is pumped with a 25W diode laser operating at 976nm. The repetition rate increases with the pump power linearly and the highest repetition rate of 77kHz is obtained in the experiment.
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| Keywords:
42.55.Wd
42.60.Gd
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Received: 16 November 2006
Published: 23 April 2007
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