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Continuously tunable coherent vacuum-ultraviolet (VUV) radiation has been generated in the 128.7-135.3-nm region by two-photon resonant four-wave mixing in Cd vapor. The generated VUV has no spectral structure over the tuning range and indicates that Cd vapor is an efficient nonlinear medium for frequency conversion.
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Miyazaki et al. (1984) studied this question.
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