Abstract
Abstract Coherent and broadly tunable over 3500 cm -1 extreme ultraviolet (XUV) radiation from 935 to 967 A has been generated by frequency tripling the second harmonic output of a rhodamine 590 pulsed dye laser in molecular nitrogen and carbon monoxide. The scheme exploits high lying Rydberg and valence states of these gases and leads to the production of about 5 × 10 9 XUV photons per pulse corresponding to a conversion efficiency of 5 × 10 -6 .
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