Abstract
Recently, we have reported a 4.3 μm fiber laser based on CO2-filled hollow-core fibers, however, the linewidth of the pump laser will become wider with the pump power increasing, resulting in the absorption decreasing of CO2. Here, we firstly study the influence of buffer gas on the absorption characteristics of CO2 in hollow-core fibers, paving the way toward high-power mid-IR fiber gas lasers.
© 2020 The Author(s)
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