We developed two Ytterbium-doped rod-type effective singlemode fibers based on new hexagonal FA-LPF design, exhibiting MFD of 47μm and 67μm. Both fibers can deliver 150W of 1030nm signal for 250W of pump power, characterized in a MOPA set-up for different nanosecond pulse durations and repetition rate with excellent beam quality (M2 ⪅ 1.1). Using the 47μm MFD fiber, TMI threshold has been measured for signal power slightly higher than 200W. Using the 67μm MFD fiber, we performed, through a third harmonic generation, the creation of 51W signal power at 343nm for 8ns temporally square pulse at 400 kHz repetition rate.
Silica fibers are successful at delivering high-power high-energy signals in the near-infrared and visible but suffer from high absorption and color formation in the UV spectrum. Hollow-core negative-curvature antiresonant fibers are promising alternatives as UV radiation has a low overlap with the guiding microstructure. However, their power scaling is hindered by the microstructure power handling and only a few tens to a few hundreds of milliwatt were reported delivered from the nano to the femtosecond regimes. We report on a record single-mode delivery of 23.3W (155μJ) with 89.1% transmission from a 343 nm, 10 ns, 150 kHz laser source developed by Bloom Lasers.
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