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Mid-infrared difference–frequency generation in periodically poled KTiOAsO4 and application to gas sensing

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Abstract

Tunable mid-infrared radiation 3.453.75 µm with a power level of 0.14 µW is generated by quasi-phase-matched difference-frequency mixing of a Nd:YAG laser and a tunable-diode laser (near 1.5 µm) in multigrating periodically poled KTiOAsO4. The wavelength and temperature bandwidths are 65 nm cm and 62°C cm, respectively. The temperature-tuning slope of the phase-matched idler wavelength, -0.94 nm/°C, is almost twice that of periodically poled KTiOPO4. We use the measurements to derive a mid-infrared-corrected Sellmeier equation for the Z axis of KTiOAsO4. The generated mid-infrared radiation is applied to sensitive high-resolution spectroscopy of the ν3 band of methane.

© 2000 Optical Society of America

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