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Guided-wave difference-frequency sources for infrared spectroscopy

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Abstract

Reported are design, performance, and spectroscopic application of an infrared source based on difference-frequency mixing of diode lasers. The source employs an annealed proton exchanged channel waveguide in periodically poled lithium niobate and operates in the 3.2–3.9 µm wavelength region at room temperature. Device efficiency of up to 4 %-W−1 and output power of up to 145 µW were obtained. Spatial and spectral characteristics of the output beam were examined. High-resolution spectroscopy and detection of several trace gases were performed.

© 2000 Optical Society of America

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