Abstract
We explored generation of high-energy nanosecond short pulses in the mid-IR wavelength range using 30–70-µm-core Er:ZBLAN fiber amplifiers. The highest energies achieved were ${\sim}0.7 \;{\rm mJ}$ at 2.72 µm in 11.5-ns-long pulses, with the corresponding peak power of 60.3 kW, obtained with a 70-µm-diameter core fiber amplifier pumped at 976 nm and seeded by a ${{\rm KTiOAsO}_4}$-based optical parametric oscillator/optical parametric amplifier system. To the best of our knowledge, these pulse energies are the highest achieved to date from mid-IR fiber lasers at longer than 2-µm wavelengths with nanosecond pulses. The achieved highest pulse energies were limited by the surface damage of unprotected fiber output facets.
© 2020 Optical Society of America
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