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[en] We report the first gas-filled fibre Raman laser emitting at 4.42 μm with an average power of 1.4 W. Its gain medium is silica revolver fibre with a molecular hydrogen (1H2) filled hollow core. Owing to the use of linearly polarised 1.56-μm pump light and a polarisation-maintaining Raman laser configuration, we have achieved a quantum efficiency of 53% for single-stage 1.56 → 4.42 μm conversion. This fibre Raman laser can find application in medicine, gas analysis and other areas. (paper)
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