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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...
We report a 4.3-mum wavelength conversion laser source using a quasi-phase-matched LiNbO3 waveguide. Using the laser source operated at ambient temperature and in the continuous wave mode, we successfully obtain CO2 isotopomer absorption lines.
The difference frequency generation arising by mixing of two near-infrared modes in a GaAs based butt-joint diode laser with germanium substrate are studied theoretically. It is shown that the power of the difference mode in the 5 - 50 THz range generated by 1-W near-infrared modes in a 100-mum-wide laser at room temperature can be 40 muW.
The room-temperature intracavity difference-frequency generation in mid-infrared spectral range have been observed in a butt-joint GaAs/InGaAs/InGaP quantum-well laser diode which supports lasing at two closely spaced wavelengths in the near-infrared range. A special asymmetric waveguide design and a low-doped substrate that minimize mid infrared losses and realize phase matching condition for the...
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