The output of a 43%-efficient continuous-wave monolithic single-oscillator Tm3+-doped fiber laser emitting 213 W at 1.94 µm is made by a passive fiber with pedestal to improve its beam quality by reducing the pedestal-to-cladding coupling.
We observed stable Q-switch operation from a Ho:YAG laser based on intracavity side-pumping by a Tm:YLF slab laser. At 400 Hz pulse energies of 1.6 mJ were obtained with pulse durations of 160 ns.
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