Abstract

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 400μm BiB3O6 crystal and pumped at 415nm in the blue, can provide visible femtosecond signal pulses across 500710nm. Using a 500μm crystal of β-BaB2O4 internal to the OPO cavity, efficient frequency doubling of the signal pulses into the UV is achieved, providing tunable femtosecond pulses across 250355nm with up to 225mW of average power at 76MHz. Cross-correlation measurements result in UV pulses with durations down to132fs for 180fs blue pump pulses.

© 2008 Optical Society of America

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