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We report the generation of high-repetition-rate picosecond pulses in the 1.3-1.5 µm spectral range by internal second harmonic generation (SHG) of an idler-resonant optical parametric oscillator (OPO) based on MgO-doped periodically-poled LiNbO3 (MgOPPLN), synchronously pumped by ∼20 ps pulses at 80 MHz using an Yb-fiber laser at 1.064 µm. By taking advantage of the high spatial quality of the resonant idler beam in the 2503-3030 nm wavelength range and using a second MgOPPLN crystal with fanout grating structure for intracavity SHG, w
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