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Pulsed photothermal interferometry (PTI) gas sensor with hollow-core photonic bandgap fibre (HC-PBF) is demonstrated with a Sagnac interferometer-based phase detection system. Under the condition of constant peak pump power, the optimal pulse duration is found to be > 1.2 μβ for detecting low-concentration of trace gases in nitrogen, limited by thermal conduction of gases within the hollow-core...
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