Study on fiber laser with China-made Yb3+-doped double-clad fiber

High power fiber laser has important application in the directed energy domain.In order to find the laser output characteristic under different fiber length and back-cavity mirrors,numerical simulation and experiment method were used.With home-made large-core Yb-dopped fiber,double-clad fiber laser system was constructed.And the signal laser with a central wavelength of 1092nm and the maximum output power of 1.6W was obtained.It was shown that optimum fiber length had important contact with back-cavity and pump power.The maximum output could be obtained with the optimum R2.It is found that the output characteristics of the fiber laser can be better by design the reflectivity ratio of the back-cavity mirror.