We report 3.8-5.0 μm tunable three-stage double-pass Fe:ZnSe solid-state MOPA with approximately 30-fold overall amplification coefficient operating at RT and pumped by EO Q-switched Cr:Er:YSGG laser system radiation. EO Q-switched Cr:Er:YSGG MOPA with the Q-switch based on a La3Ga5SiO14 crystal providing 90 ns pulses with energy up to 350 mJ at a 3 Hz repetition rate was used as a pump source. The maximum output energies of Fe:ZnSe system in 90 ns pulses exceeded 55 mJ at 4.4 μm under 220 mJ of pumping. The pulse jitter was measured to be ⪅8 ns and was limited by the Er:Cr:YSGG laser jitter.
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Martyshkin et al. (2024) studied this question.
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