High pulse energy and quantum efficiency mid-infrared gas Raman fiber laser targeting CO2 absorption at 4.2  µm

Yazhou Wang*, Manoj Kumar Dasa, Abubakar Isa Adamu, J E Antonio-Lopez, Md Selim Habib, Rodrigo Amezcua-Correa, Ole Bang, Christos Markos

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this Letter, we demonstrate a high pulse energy and linearly polarized mid-infrared Raman fiber laser targeting the strongest absorption line of ${\rm CO}_2$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.
Original languageEnglish
JournalOptics Letters
Volume45
Issue number7
Pages (from-to)1938-1941
ISSN0146-9592
DOIs
Publication statusPublished - 2020

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