Abstract
Nd:YAG and a Nd:YAG-pumped dye laser are used to generate tunable deep ultraviolet radiation down to 240 nm in a lithium triborate crystal (LBO) by noncollinear sum-frequency mixing. All longer wavelengths can be generated by a combination of harmonic generation of the dye laser and sum-frequency mixing, 240 nm being the near noncritical limit. A set of versatile Sellmeier dispersion equations is derived to satisfactorily predict phase-matching in LBO.
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