Efficient ultrafast ultraviolet generation based on frequency doubling in short-period periodically-poled KTiOPO_4 crystal

摘要

We have efficiently generated ultrafast coherent ultraviolet (UV) pulses based on second-harmonic generation in a periodically-poled KTiOPO_4 crystal with the period as short as 2.55 μm. The highest output power is measured to be 20.1 mW at 377.1 nm with the conversion efficiency of 15.6%. Such an output wavelength is probably among the shortest ones generated by forward second-harmonic generation in a periodically-poled KTiOPO_4 crystal.