Journal article
High pulse energy and quantum efficiency mid-infrared gas Raman fiber laser targeting CO2 absorption at 4.2 µm
In this Letter, we demonstrate a high pulse energy and linearly polarized mid-infrared Raman fiber laser targeting the strongest absorption line of ${\rm CO}_2$CO2 at $\sim{4.2}\;\unicode {x00B5} {\rm m}$∼4.2µm. This laser was generated from a hydrogen (${\rm H}_2$H2)-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 ${\rm H}_2$H2 pressure was required to maximize the pulse energy since the transient Raman regime was efficiently suppressed by the long pump pulses.
Language: | English |
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Year: | 2020 |
Pages: | 1938-1941 |
ISSN: | 15394794 and 01469592 |
Types: | Journal article |
DOI: | 10.1364/ol.389613 |
ORCIDs: | 0000-0001-7601-0617 , 0000-0001-5506-1669 , 0000-0003-0161-5325 , Markos, Christos , Wang, Yazhou and Bang, Ole |