Intense infrared radiation has been produced in the 3–4μ region by generating the difference frequency between a wavelength-tunable dye laser and a Q-switched ruby laser. Saturation of the conversion of ruby photons to sum-and-difference frequencies was observed on a single pass through a phase-matched LiNbO3 crystal. The system appears to be attractive as a simple, highly efficient, and broadly tunable infrared source.
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Dewey et al. (1971) studied this question.
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