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We report phase-modulation mode-locking of a continuous-wave (cw) singly- resonant optical parametric oscillator (OPO) in the near- and mid-infrared based on MgO-doped periodically poled $\hbox{LiNbO}_{3} $ (MgO:PPLN) and pumped by an Yb-fiber laser at 1064 nm. By investigating the spectral output and pulse formation characteristics of the OPO, we observe a clear transition from an unstable spectrum...
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