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We demonstrate a two-crystal mid-infrared dual-wavelength optical parametricoscillator, synchronously pumped by a high power femtosecond Yb:fiber laser.The singly-resonant ring cavity, containing two periodically poled lithiumniobate crystals, is capable of generating two synchronized idler wavelengths,independently tunable over 30 THz in the 2.9 - 4.2 {\mu}m wavelength region,due to the cascaded quadratic nonlinear effect. The independent tunability ofthe two idlers makes the optical parametric oscillator a promising source forultrafast pulse generation towards the THz wavelength region, based ondifferent frequency generation. In addition, the observed frequency doubledidler within the crystal indicates the possibility to realize a broadbandoptical self-phase locking between pump, signal, idler and higher ordergenerated parametric lights.

Broadly, independent-tunable, dual-wavelength mid-infrared ultrafast optical parametric oscillator