operating at 1090 nm that is capable of generating 2.3 mJ of output pulse energy at a 500-
Hz repetition rate and more than 5 W of average output power at higher repetition rates in a
high-brightness beam M^ 2= 3. Using a similar fiber with a smaller core, we generated> 0.5‐
mJ pulses in a diffraction-limited beam. Our results represent a threefold increase in pulse
energy over previously published values for Q-switched fiber lasers and firmly establish fiber …