Abstract
Efficiency for vuv generation in a glass hollow waveguide has been compared with that obtained by tight focussing of the primary radiation. Coherent vuv radiation is generated by resonant four-wave difference frequency mixing and four-wave parametric processes in xenon. At vuv wavelengths close to the 5p-6s resonance, the efficiency of generation was found to be enhanced by a factor of up to 2.5 under phase-matched conditions. The measured enhancement is limited by losses due to absorption of the generated radiation and by propagation losses of the primary beams along the waveguide.
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