Ultrafast picosecond MOPA With Yb-doped tapered double clad fiber

Recent rapid progress of high-power picosecond and femtosecond fiber MOPA technology is remarkable. The picosecond MOPA has already crossed the threshold of mJ-level [1]. Usually, these powerful amplification systems contain unbendable rod-type fibers and, therefore, optical schemes are bulky and cumbersome [1]. Nevertheless, the industry requires a simple, all-fiber MOPA system with high peak power and energy. Recently, to reduce thermal stresses and influence of nonlinear effects all-fiber picosecond fiber laser using doping management have been proposed [2, 3].