Tunable single-frequency continuous-wave coherent VUV radiation is generated at lambda(VUV) = 143.6 nm by resonant frequency tripling in Mg. The frequency of the output of a frequency-stabilized dye ring laser (spectral width Deltaupsilon < 1 MHz) is tuned to the two-photon transition 3s(2)(1)S(0)-3s3d(1)D(2) (lambda = 430.9 nm) of Mg. A laser power of 0.2 W produces at the third harmonic more than 1.2 x 10(5) photons/sec (1.8 x 10(-13) W). Radiation generated by this method will provide laser VUV spectroscopy of highest spectral resolution.
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Timmermann et al. (1983) studied this question.