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Resonantly-enhanced rare-gas-halide laser frequency up-conversion in Mg vapor

Frequency up-conversion of XeCl-laser radiation (308 nm) and KrF-laser radiation (249 nm) by two-photon resonantly enhanced four-wave mixing in Mg vapor is reported. A dye laser tuned to two-photon resonance with the 3s-3d(1)D(2) Mg level was used. The dependences of generated signals at 127 and 115 nm on input intensity and number density were investigated. No saturation was observed up to 4 x 10(9) W/cm(2) (249 nm) and 6 x 10(8) W/cm(2) (308 nm). The 115-nm signal was phase matched by using Xe. Conversion efficiencies and signal linewidths are discussed.