Suppressing nonlinear effects for power scaling of high power fiber lasers

Anping Liu; Xin Chen; Ming-Jun Li; Ji Wang; Donnell T. Walton; Luis A. Zenteno

doi:10.1117/12.745958

21 November 2007 Suppressing nonlinear effects for power scaling of high power fiber lasers

Anping Liu, Xin Chen, Ming-Jun Li, Ji Wang, Donnell T. Walton, Luis A. Zenteno

Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67810H (2007) https://doi.org/10.1117/12.745958
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

Suppressing nonlinear effects such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) in high power fiber amplifiers and lasers is crucial for scaling up output power well beyond kW levels. The paper uses a sophisticated model to analyze many different fiber amplifier designs and compare their performance. The systematic modeling reveals many interesting results and shows that a co-pumped amplifier can be optimized by carefully choosing fiber lengths and applying additional heating to the fiber. It also explains why the amplifier configuration can make great impacts on SBS characteristics. In addition, a single-polarized fiber having an effective area of 206 μm² and cutoff wavelength of 1100 nm is designed to suppress SRS and provide better polarization properties. The systematic modeling concludes that in general a counter-pumped fiber amplifier has the lowest nonlinear effects and is less sensitive to the fiber length comparing with the co-pumped amplifiers. However, the co-pumped amplifier is easy to integrate with an all-fiber-based pump combiner without risking LD damage and it can be heated to increase SBS threshold by a factor of 1.7.

Citation Download Citation

Anping Liu, Xin Chen, Ming-Jun Li, Ji Wang, Donnell T. Walton, and Luis A. Zenteno "Suppressing nonlinear effects for power scaling of high power fiber lasers", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67810H (21 November 2007); https://doi.org/10.1117/12.745958

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