Abstract
Vacuum ultraviolet laser output energies of 0.25 mJ (2 MW cm -2 unfocused) at 130 nm have been achieved using four-wave sum-frequency mixing in mercury. High energy conversion efficiencies of 2.7 percent have been demonstrated in a collimated beam geom1etry over 1 meter interaction lengths. The 130 nm radiation is tunable over 2.5 cm -1 and the pulse length is 2.2 ns. The experimental facility assembled to produce this efficient VUV laser will be described, and comparison between experimental measurements and theory are provided.
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