Sum-frequency mixing of CO(2) and He-Ne lasers in proustite.
The first known demonstration of efficient sum-frequency mixing of a CO(2) and a He-Ne laser in 77-K cooled proustite is reported. A power-conversion efficiency comparable with that of difference-frequency mixing is obtained. The excellent signal-to-noise ratio of the Fabry-Perot fringes that are obtained leads to the feasibility of wavelength measurement of a stabilized CO(2) laser by a sum-mixing technique, which can complement the conventional difference-mixing technique.
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