Abstract
Resonant third-order sum-frequency mixing of continuous-wave visible and ultraviolet laser light is investigated in the metal vapors of Sr, Ca, Mg, and Zn. The laser radiation (with the frequencies ω1, ω2, and ω3) is generated by single-mode dye- and argonion lasers. The third-order nonlinear susceptibility is enhanced by tuning the laser frequencies 2ω1 or ω1+ω2 to a two-photon resonance. The wavelength of the generated coherent VUV radiation (with the frequency ωVUV=3ω1, ωVUV=2ω1+ω2 or ωVUV=ω1+ω2+ω3) is tunable in spectral regions between 133 and 217 nm. For most conversion processes an additional enhancement of the nonlinearity is provided by an autoionizing level or by a highly excited state close to E=ħωVUV. With laser powers of 0.2–3 W the power of the generated sum frequencies is in the range of 5×105–6×1010 photons s−1 (0.5 pW–60 nW).
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