1.2 kW Average Power from Coherently Combined Single-Frequency Nanosecond All-Fiber Amplifier Array

We report coherent combining of seven nanosecond all-fiber amplifier array with overall average power of 1.2 kW. The power amplifier array consisted of seven three-stage cascaded all-fiber amplifier. The temporal overlap of pulses from different amplifiers was realized by strictly controlling optical path difference (OPD). When the laser beams were actively phase-locked using single frequency dithering technique, the contrast of long-exposure far-field intensity pattern of the combined beam was more than 89.1%. The combined pulsed laser has a pulse width of ~3 ns, a repetition rate of 5 MHz and a peak power of 75.1 kW.

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