Difference frequency generation: Spectrometers and spectroscopy
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The theory of difference frequency generation has been further developed. Derived from basic principles, the equations developed here accurately predict the conversion of power to the idler wave. Critical phasematching can now be modeled with ellipticity in both beams and the effects of double refraction and non-normal incidence upon the crystal treated. It is no longer necessary to focus the beams into the center of the crystal nor is it necessary to have an equal confocal parameter in the two drive beams.
A mid-infrared spectrometer based on titanium:sapphire pumped difference frequency generation in silver thiogallate (AgGaS
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Eckhoff, Wade Charles. "Difference frequency generation: Spectrometers and spectroscopy." (1997) Diss., Rice University. https://hdl.handle.net/1911/19152.