We present simultaneous efficient second-͑SHG͒ and third-harmonic generation ͑THG͒ in a single periodically-poled KTP waveguided crystal pumped by a compact femtosecond Yb-based laser in a condition of exactly phase-matched frequency doubling and nonphase-matched sum-frequency mixing processes. Internal conversion efficiency as high as 33% for SHG ͑532 nm͒ and ϳ2% for the cascaded THG ͑355 nm͒ is reported. We believe this to be a clear experimental demonstration that strong third-harmonic can be generated in frequency doubling crystals through a nonphase-matched sum-frequency mixing process.
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