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Tunable continuous wave DFG-based gas sensor using fibre amplified 1.5 µm external cavity diode laser and high power 1 µm diode laser

Tunable continuous wave DFG-based gas sensor using fibre amplified 1.5 µm external cavity diode laser and high power 1 µm diode laser

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A novel compact, room-temperature mid-infrared difference frequency generation (DFG)-based trace gas sensor based on direct absorption spectroscopy is reported. Tunable, narrow linewidth difference frequency radiation from 3.3 to 3.5 µm is generated in periodically poled lithium niobate at power levels of > 4 µW. The output from an external cavity diode laser, amplified up to 20 dBm by an erbium-doped fibre amplifier is used as the signal source. A 500 mW α-DFB diode laser at 1066 nm serves as the DFG pump source. This sensor has been applied to real time trace gas detection of CH4 and H2CO.

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