New Development of Nonlinearity Management in High Power Fiber Lasers and Amplifiers

The scalability of output power and transmission characteristic of high power fiber lasers and amplifiers are limited by nonlinear effects such as stimulated Brillouin scattering, stimulated Raman scattering and self-phase modulation. These limitations can be overcome through improving the fiber in geometric structure or compositional distribution, doped technology, working conditions etc. This paper firstly discusses the mechanism of production and the properties of power threshold about nonlinear effects of fiber lasers and amplifiers. Then it emphasizes particularly on the new methods and technologies used in nonlinearity management. The new managing way like large-mode-area fiber designing as well as varying doped componments and distribution,direct nanoparticle deposition doping and controlling strain or temperature effects is introduced in detail. Finally, it presents reasonable schemes.