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Efficient Raman generation in a molecular hydrogen-filled hollow-core fibre having a cladding in the form of a single ring of capillaries has been demonstrated for the first time. The pump source used was a Q -switched Nd : YAG laser with a pulse duration of 125 ns , and a single-pass (cavity-free) configuration was employed. The maximum average output power at μ 1.9 μ m was 300 mW , and the differential quantum efficiency was 87 %, a record level for such experiments.
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Gladyshev et al. (2015) studied this question.
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