We report efficient generation of tunable femtosecond pulses in the ultraviolet (UV) by intracavity doubling of a visible femtosecond optical parametric oscillator (OPO). The OPO, based on a crystal and pumped at in the blue, can provide visible femtosecond signal pulses across . Using a crystal of internal to the OPO cavity, efficient frequency doubling of the signal pulses into the UV is achieved, providing tunable femtosecond pulses across with up to of average power at . Cross-correlation measurements result in UV pulses with durations down to for blue pump pulses.
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