Abstract

An actively $Q$-switched mid-infrared Fe:ZnSe laser pumped by a continuous wave fluoride fiber laser has been developed. Stable operation with a pulse duration of 20 ns and a repetition rate of 40 kHz at 4 µm was achieved. The maximum peak power was 1.1 kW. The high-repetition rate, high-peak power nanosecond pulsed laser, which has been created for the first time, to the best of our knowledge, in an actively $Q$-switched Fe:ZnSe laser, should prove a suitable light source for laser processing and molecular sensing.

© 2020 Optical Society of America

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