Abstract
In this Letter, a high-power 1.9-4.2μm supercontinuum (SC) laser source with a real all-fiber structure is reported. A 12m length of ZBLAN fluoride fiber was used as the nonlinear medium, which was pumped by a thulium-doped fiber amplifier through a firm fusion-spliced joint between silica fiber and itself. The obtained SC laser had a high spectral flatness with a maximal 10dB bandwidth of 2090nm spanning from 1960 to 4050nm. A record power of 15.2W for an all-fiber mid-infrared SC laser was measured. The average spectral power density of this SC laser was as high as 7.2mW/nm. In particular, the SC power beyond 3.0 and 3.8μm was 8.1 and 1.08W which corresponded to a power ratio of 53.2% and 7.1%, respectively. This Letter, to the best of our knowledge, represents the brightest all-fiber mid-infrared SC laser, and provides a promising high-power pump light for SC generation in cascaded chalcogenide fibers.
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