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Sub-ns pulse mid-IR lasers have many important scientific and industrial applications including optical parametric chirped-pulse amplification pump sources and material processing. Unfortunately, effective sub-ns mid-IR laser sources are limited. In this study, we report on the numerical simulation and optimization of a spike-like oscillation dynamic in room temperature mid-IR Fe:ZnSe lasers operating at 4.4 µm to obtain sub-ns relaxation oscillation pulses from 15 ns Q-switched Er:YSGG pump pulses. Optimizing cavity length, iron ion concentration, and output coupler reflectivity yielded a single 588 ps pulse (FWHM) with an output energy of 1.7 mJ. This was achieved using a pump pulse energy of 17mJ (140 mJ/cm2) at a 2.79 μm wavelength.
Conference Presentation
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Kiyoshi Yamamoto andVladimir Fedorov
"Modeling of sub-nanosecond Fe:ZnSe mid-IR gain-switched laser operating at room temperature", Proc. SPIE 12864, Solid State Lasers XXXIII: Technology and Devices, 1286405 (12 March 2024); https://doi.org/10.1117/12.3002811
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Kiyoshi Yamamoto, Vladimir Fedorov, "Modeling of sub-nanosecond Fe:ZnSe mid-IR gain-switched laser operating at room temperature," Proc. SPIE 12864, Solid State Lasers XXXIII: Technology and Devices, 1286405 (12 March 2024); https://doi.org/10.1117/12.3002811