Pulsed photothermal interferometry for spectroscopic gas detection with hollow-core optical fibre

Yuechuan Lin; Wei Jin; Fan Yang; Jun Ma; Chao Wang; Hoi Lut Ho; Yang Liu

doi:10.1038/srep39410

Pulsed photothermal interferometry for spectroscopic gas detection with hollow-core optical fibre

Yuechuan Lin, Wei Jin, Fan Yang, Jun Ma, Chao Wang, Hoi Lut Ho, Yang Liu

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

64 Citations (Scopus)

Abstract

Gas detection with hollow-core photonic bandgap fibre (HC-PBF) and pulsed photothermal (PT) interferometry spectroscopy are studied theoretically and experimentally. A theoretical model is developed and used to compute the gas-absorption-induced temperature and phase modulation in a HC-PBF filled with low-concentration of C2H2in nitrogen. The PT phase modulation dynamics for different pulse duration, peak power and energy of pump beam are numerically modelled, which are supported by the experimental results obtained around the P(9) absorption line of C2H2at 1530.371 nm. Thermal conduction is identified as the main process responsible for the phase modulation dynamics. For a constant peak pump power level, the phase modulation is found to increase with pulse duration up to ∼1.2 μs, while it increases with decreasing pulse duration for a constant pulse energy. It is theoretically possible to achieve ppb level detection of C2H2with ∼1 m length HC-PBF and a pump beam with ∼10 ns pulse duration and ∼100 nJ pulse energy.

Original language	English
Article number	39410
Journal	Scientific Reports
Volume	6
DOIs	https://doi.org/10.1038/srep39410
Publication status	Published - 23 Dec 2016

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10.1038/srep39410

http://hdl.handle.net/10397/65842

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title = "Pulsed photothermal interferometry for spectroscopic gas detection with hollow-core optical fibre",

abstract = "Gas detection with hollow-core photonic bandgap fibre (HC-PBF) and pulsed photothermal (PT) interferometry spectroscopy are studied theoretically and experimentally. A theoretical model is developed and used to compute the gas-absorption-induced temperature and phase modulation in a HC-PBF filled with low-concentration of C2H2in nitrogen. The PT phase modulation dynamics for different pulse duration, peak power and energy of pump beam are numerically modelled, which are supported by the experimental results obtained around the P(9) absorption line of C2H2at 1530.371 nm. Thermal conduction is identified as the main process responsible for the phase modulation dynamics. For a constant peak pump power level, the phase modulation is found to increase with pulse duration up to ∼1.2 μs, while it increases with decreasing pulse duration for a constant pulse energy. It is theoretically possible to achieve ppb level detection of C2H2with ∼1 m length HC-PBF and a pump beam with ∼10 ns pulse duration and ∼100 nJ pulse energy.",

author = "Yuechuan Lin and Wei Jin and Fan Yang and Jun Ma and Chao Wang and Ho, {Hoi Lut} and Yang Liu",

year = "2016",

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doi = "10.1038/srep39410",

language = "English",

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T1 - Pulsed photothermal interferometry for spectroscopic gas detection with hollow-core optical fibre

AU - Lin, Yuechuan

AU - Jin, Wei

AU - Yang, Fan

AU - Ma, Jun

AU - Wang, Chao

AU - Ho, Hoi Lut

AU - Liu, Yang

PY - 2016/12/23

Y1 - 2016/12/23

N2 - Gas detection with hollow-core photonic bandgap fibre (HC-PBF) and pulsed photothermal (PT) interferometry spectroscopy are studied theoretically and experimentally. A theoretical model is developed and used to compute the gas-absorption-induced temperature and phase modulation in a HC-PBF filled with low-concentration of C2H2in nitrogen. The PT phase modulation dynamics for different pulse duration, peak power and energy of pump beam are numerically modelled, which are supported by the experimental results obtained around the P(9) absorption line of C2H2at 1530.371 nm. Thermal conduction is identified as the main process responsible for the phase modulation dynamics. For a constant peak pump power level, the phase modulation is found to increase with pulse duration up to ∼1.2 μs, while it increases with decreasing pulse duration for a constant pulse energy. It is theoretically possible to achieve ppb level detection of C2H2with ∼1 m length HC-PBF and a pump beam with ∼10 ns pulse duration and ∼100 nJ pulse energy.

AB - Gas detection with hollow-core photonic bandgap fibre (HC-PBF) and pulsed photothermal (PT) interferometry spectroscopy are studied theoretically and experimentally. A theoretical model is developed and used to compute the gas-absorption-induced temperature and phase modulation in a HC-PBF filled with low-concentration of C2H2in nitrogen. The PT phase modulation dynamics for different pulse duration, peak power and energy of pump beam are numerically modelled, which are supported by the experimental results obtained around the P(9) absorption line of C2H2at 1530.371 nm. Thermal conduction is identified as the main process responsible for the phase modulation dynamics. For a constant peak pump power level, the phase modulation is found to increase with pulse duration up to ∼1.2 μs, while it increases with decreasing pulse duration for a constant pulse energy. It is theoretically possible to achieve ppb level detection of C2H2with ∼1 m length HC-PBF and a pump beam with ∼10 ns pulse duration and ∼100 nJ pulse energy.

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DO - 10.1038/srep39410

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SN - 2045-2322

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JO - Scientific Reports

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M1 - 39410

ER -

Pulsed photothermal interferometry for spectroscopic gas detection with hollow-core optical fibre

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