Abstract

Nonresonant sum- and difference-frequency mixing of the fundamental ωL and the second harmonic ωUV radiation of a powerful narrowband pulsed dye laser system excited by an Nd:YAG laser (λL = 5500–6500 Å) generates intense VUV radiation in krypton and xenon with the frequency ωVUV = 2ωUV ± ωL. The sum-frequency is tunable in spectral regions of negative dispersion between 1100 and 1300 Å. The maximum VUV pulse power exceeds 20 W (5 × 1010 photons/pulse). VUV light pulses with up to 60 W (2.3 × 1011 photons/pulse) are provided by the difference-frequency at wavelengths between 1850 and 2070 Å. In addition the conversion process ωVUV = 2ωUVωIR (ωIR is the frequency of the Nd:YAG laser) generates radiation in the wavelength range of 1595–1866 Å. With present laser systems the tuning range of the difference-frequency could be extended to wavelengths as short as 1226 Å. The sum- and difference-frequency conversion will thus provide intense coherent VUV light continuously tunable between 1100 and 2100 Å.

© 1982 Optical Society of America

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