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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 28, Iss. 10 — Mar. 15, 2010
  • pp: 1435–1442

Detection of CH$_{4}$ in the Mid-IR Using Difference Frequency Generation With Tunable Diode Laser Spectroscopy

Ian Armstrong, Walter Johnstone, Kevin Duffin, Michael Lengden, Arup Lal Chakraborty, and Keith Ruxton

Journal of Lightwave Technology, Vol. 28, Issue 10, pp. 1435-1442 (2010)

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This paper demonstrates detection of methane using tunable diode laser spectroscopy (TDLS) through difference frequency generation (DFG) in order to address fundamental rotational-vibrational absorption lines, located around 3404 nm. Direct detection confirms that wavelength referencing of recovered lineshapes, developed for Near infra-red (Near-IR) systems, has been successfully transferred to the presented Middle infra-red (Mid-IR) system. Traditional 1f and 2 f TDLS with WMS detection regimes are also functionally confirmed analogous to their Near-IR equivalents.

© 2010 IEEE

Ian Armstrong, Walter Johnstone, Kevin Duffin, Michael Lengden, Arup Lal Chakraborty, and Keith Ruxton, "Detection of CH$_{4}$ in the Mid-IR Using Difference Frequency Generation With Tunable Diode Laser Spectroscopy," J. Lightwave Technol. 28, 1435-1442 (2010)

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