Abstract

In this Letter, we demonstrate a high pulse energy and linearly polarized mid-infrared Raman fiber laser targeting the strongest absorption line of ${\rm CO}_2$ at $\sim{4.2}\;\unicode {x00B5} {\rm m}$. This laser was generated from a hydrogen (${\rm H}_2$)-filled antiresonant hollow-core fiber, pumped by a custom-made 1532.8 nm Er-doped fiber laser delivering 6.9 ns pulses and 11.6 kW peak power. A quantum efficiency as high as 74% was achieved, to yield 17.6 µJ pulse energy at 4.22 µm. Less than 20 bar ${\rm H}_2$ pressure was required to maximize the pulse energy since the transient Raman regime was efficiently suppressed by the long pump pulses.

© 2020 Optical Society of America

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