Abstract

Fourier-transform-limited extreme-ultraviolet (XUV) radiation (bandwidth 300MHz) tunable around 91 nm is produced by use of two-photon resonance-enhanced four-wave mixing on the Kr resonance at 94093cm1. Noncollinear phase matching ensures the generation of an XUV sum frequency 2ω1+ω2 that can be filtered from auxiliary laser beams and harmonics by an adjustable slit. Application of the generated XUV light is demonstrated in spectroscopic investigations of highly excited states in H2 and N2.

© 2005 Optical Society of America

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