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STIMULATED RAMAN SPECTROSCOPY FOR REAL-TIME, HIGH-RESOLUTION MOLECULAR ANALYSIS OF GASES IN HOLLOW CORE FIBRES
STIMULATED RAMAN SPECTROSCOPY FOR REAL-TIME, HIGH-RESOLUTION MOLECULAR ANALYSIS OF GASES IN HOLLOW CORE FIBRES
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机译:用于实时、高分辨率分析空心纤维中气体的受激拉曼光谱
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摘要
A stimulated Raman scattering spectrometer for real-time, high- resolution molecular analysis of gases is based on two hollow-core fibres (420, 450) illuminated by a single high-power, short-pulse laser pump. The first fibre (420) is prefilled with high-concentration target gases. Interaction of each target gas inside the first fibre (420), with the laser pump, generates Raman signals corresponding to the target gases. The combined beam of the Raman signals and the pump laser beam is directed into the second fibre (450) containing the measured target gases. Interaction of each target gas with the combined beam generates the Stimulated Raman Growth, i.e., amplification of the Raman signal, which is proportional to the corresponding target gas concentration. A receiver subsystem (30) receives the beam from the second fibre (450), spectrally separates it to wavelengths corresponding to each target gas, extracts the Stimulated Raman Growth value corresponding to each target gas and calculates the concentration of each target gas.
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