Abstract
We demonstrated a mode-controllable fiber laser system with output power of 1.4 kW level. The system consists of a kilowatt-scale master oscillator power amplifier and an active feedback control system based on the stochastic parallel-gradient descent algorithm. We can convert the LP01 and LP11 modes by performing an extremum search for power in the bucket of the output beam. Under the same pump power, we obtain the mode conversion of LP11 to LP01, and the efficiency is as high as 99.5%. The maximum output power of LP11 and LP01 mode are 1396 W and 1389 W, respectively, with corresponding slope efficiencies of 85.8% and 84.1%.
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