Abstract
Coherent radiation at 87.78 nm is generated by four-wave mixing in argon gas. Radiation of a mode-locked Nd:YLF laser at λ=1053 nm is regeneratively amplified at 1 kHz repetition rate. After frequency quadrupling in consecutive LBO and BBO crystals, the UV radiation at 263.35 nm is focused in Ar in front of a hollow capillary. Effects of gas density on the XUV intensity are discussed.
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