Abstract
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
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