Abstract
Noncollinear mixing of radiation from CO2 TEA lasers has been used to generate phase-matched far-infrared difference-frequency radiation in GaAs. The wavelength of the far-infrared radiation was tuned from [inverted lazy s] 70 μm to 2 mm in small steps by selecting the frequencies of the two CO2 lasers by means of intracavity diffraction gratings. A theoretical analysis of the two-dimensional phase matching is presented.
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