Abstract

We report a high-energy nanosecond ${\rm{KTiOAs}}{{\rm{O}}_4}$-based optical parametric oscillator and amplifier system driven by a 1064-nm, injection-seeded, $Q$-switched Nd:YAG laser to provide mid-infrared pumping for few-cycle optical parametric chirped-pulse amplification operating in the long-wave infrared spectral regime. An output energy of 10.5 mJ at 2726 nm was obtained from the final power amplifier with a spectral width of 2.8 nm, pulse duration of 1.2 ns, and ${{\rm{M}}^2}$ value of 2.4. The parametric source provides for the second mode of operation, where 10-ns pulses are produced by disabling the electro-optic slicing that enables the 1-ns mode. For 10-ns operation, the source produced energy of 25 mJ with a ${{\rm{M}}^2}$ value of 2.8.

© 2021 Optical Society of America

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