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May 15, 2000 / Vol. 25, No. 10 / OPTICS LETTERS 743 Mid-infrared differencefrequency generation in periodically

Summary: May 15, 2000 / Vol. 25, No. 10 / OPTICS LETTERS 743
Mid-infrared difference­frequency generation in periodically
poled KTiOAsO4 and application to gas sensing
K. Fradkin-Kashi, A. Arie, P. Urenski, and G. Rosenman
Department of Electrical Engineering--Physical Electronics, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
Received January 10, 2000
Tunable mid-infrared radiation 3.45 3.75 mm with a power level of 0.14 mW is generated by quasi-phase-
matched difference-frequency mixing of a Nd:YAG laser and a tunable-diode laser (near 1.5 mm) 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, 20.94 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 n3 band of methane. 2000 Optical Society of America
OCIS codes: 190.4360, 190.4400, 300.6340.
Difference-frequency mixing in nonlinear materials is
a powerful method for producing mid-infrared (mid-
IR) coherent radiation sources by use of compact and
efficient lasers, which now exist principally in the


Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University


Collections: Engineering