2 mJ Pulse Energy, 420kW Peak Power, All-Fiber Amplifier with Diffraction-Limited Beam Quality

Yaakov Glick (Soreq NRC, Applied Physics Division), Jose Pincha, Ishu Kansal, Robert Windeler, Vasiliy Lukonin, Eric Monberg, Erin S. Lamb and Jeffrey W. Nicholson

We demonstrate record high energy of 2 mJ, with 4 nanosecond pulses a peak power of >420 kW and average power of 660 W, in a fiber amplifier using a novel 26 µm mode-field diameter Yb-doped gain fiber. The TMI threshold for this fiber was measured to be 1kW. This is achieved at a diffraction limited beam quality of M2=1.14.