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A compact and versatile femtosecond mid-IR source is presented, based on anoptical parametric oscillator (OPO) synchronously pumped by a commercial250-MHz Er:fiber laser. The mid-IR spectrum can be tuned in the range 2.25-2.6\mu m (signal) and 4.1-4.9 \mu m (idler), with average power from 20 to 60 mW.At 2.5 \mu m a minimum pulse duration of 110 fs and a power of 40 mW have beenobtained. Active stabilization of the OPO cavity length has been achieved inthe whole tuning range.

250-MHz synchronously pumped optical parametric oscillator at 2.25-2.6 {\mu}m and 4.1-4.9 {\mu}m