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Distributed photothermal spectroscopy in microstructured optical fibers: towards high resolution mapping of gas presence over long distances

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Figure

Figure 1.5. Absorption spectrum of acetylene measured at λ = 1.5 µ m with a high- high-resolution OSA
Fig. 3. Left: simplified cross section employed to model the steady temperature distribution of the MSF (not to scale); Right: scheme showing the general notation used for an arbitrary cylindrical shell within the structure
Fig. 4. Scheme of the experimental setup employed. Acronyms are explained within the text.
Fig. 5. General thermal behavior of the acetylene-filled MSF (at z = (1.3 ± 1) m) when the pump is: (a) switched on (laser off-resonance plus EDFA); (b) tuned on-resonance; (c) tuned off-resonance; (d) switched off (P pump ≈ 70 mW)
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