Abstract
A compact and tunable difference frequency generation mid-infrared laser for gas sensing is developed using a quasi-phase-matched LiNbO3 (QPM-LN) waveguide and a tunable laser diode array (TLA). The absorption spectra of methane from the −third- to +fifth-order around 3.3 µm are observed by tuning the QPM-LN waveguide temperature and the TLA wavelength. The absorption line width is investigated with high spectral resolution scanning and the result is compared with that calculated from the HITRAN database.
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