Abstract
Tunable coherent XUV radiation down to 75 nm was generated by two-photon resonant four-wave mixing of a tunable ArF excimer laser with a dye laser in a molecular gas jet of hydrogen. The obtained XUV spectral profiles reflected the double resonance effect at Rydberg states in H 2 molecules. This scheme has a possibility to extend the shortest wavelength limit of the tunable radiation down to 66 nm by using a frequency-doubled dye laser.
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