An optimization of Raman effects in tandem-pumped Yb-doped kilowatt fiber amplifiers

Tianzi Zhang; Yingchun Ding; Zhongxuan Liu; Wupeng Gong

doi:10.1117/12.2189064

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17 July 2015 An optimization of Raman effects in tandem-pumped Yb-doped kilowatt fiber amplifiers

Tianzi Zhang, Yingchun Ding, Zhongxuan Liu, Wupeng Gong

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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95240Y (2015) https://doi.org/10.1117/12.2189064
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

Kilowatt Ytterbium-doped fiber laser is found widespread application in medical technology, industry and military areas. At present, most of the multi-kilowatt single-mode fiber lasers are achieved by tandem-pumped master oscillator power-amplifier (MOPA) system. When the laser output power reaches kilowatt, the output will be strongly affected by nonlinear effects in the amplifier. The Stimulated Raman Scattering effects is known as the major restrictions to the increase of output signal power. Up to now, Raman effects in conventional diode-pumped amplifier have been well studied while the Raman effects in tandem-pumped has not yet been thoroughly analyzed. In this paper, a theoretical analysis of Raman effects using numerical solution of steady-state rate equations in kilowatts tandem-pumped ytterbium-doped fiber amplifiers is presented. The numerical simulation describing output power characteristics and laser distribution along the fiber is carried under the co-directional end-pumping. Furthermore, an optimization of Raman effects is discussed, which provides a solid foundation for achieving a higher fiber laser output.

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Tianzi Zhang, Yingchun Ding, Zhongxuan Liu, and Wupeng Gong "An optimization of Raman effects in tandem-pumped Yb-doped kilowatt fiber amplifiers", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95240Y (17 July 2015); https://doi.org/10.1117/12.2189064

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