Two tunable dye lasers have been used to generate coherent radiation at a tunable sum frequency in the vacuum-ultraviolet spectral region. Spectral ranges of {~}3500 cm^-1 around 1895 {} and {~}1200 cm^-1 around 1798 {} have been covered. These ranges may easily be extended. Large ({~}×{}10⁴) enhancements of 2ν₁+ν₂ sum mixing are seen when 2ν₁ is tuned to a double-quantum allowed transition from the ground state in Sr vapor.
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Hodgson et al. (1974) studied this question.
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