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Abstract
We report a degenerate self-phase-locked picosecond optical parametric oscillator (OPO) synchronously pumped by a mode-locked Yb-fiber laser at 1064 nm, delivering broadband output near 2 µm with 2.8 W of average power at ${\sim}{{80}}\;{\rm{MHz}}$ repetition rate. By exploiting a 50-mm-long MgO:PPLN crystal providing high gain and low group velocity dispersion under type-0 ($e \to ee$) phase matching, the OPO generates a phase-locked degenerate output spectrum with a bandwidth of ${\sim}{{202}}\;{\rm{nm}}$ centered at 2128 nm in pulses of ${\sim}{{21}}\;{\rm{ps}}$ duration with excellent passive long-term power and spectral stability in high spatial beam quality. Phase-locked operation results in spectral and power stabilization at exact degeneracy and is further validated by $f - 2f$ interferometry and radio frequency measurements of OPO output. To the best of our knowledge, this is the first degenerate self-phase-locked OPO in picosecond time scale, and the highest average power reported for a phase-locked ultrafast OPO to date.
© 2020 Optical Society of America
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