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We present the design and experimental proof of principle of a low thresholdoptical parametric oscillator (OPO) that continuously oscillates over a largebandwidth allowed by phase matching. The large oscillation bandwidth isachieved with a selective two-photon loss that suppresses the inherent modecompetition, which tends to narrow the bandwidth in conventional OPOs. Ourdesign performs pairwise mode-locking of many frequency pairs, in directequivalence to passive mode-locking of ultrashort pulsed lasers. The ability toobtain high powers of continuous \textit{and} broadband down-converted lightenables the optimal exploitation of the correlations within the down-convertedspectrum, thereby strongly affecting two-photon interactions even atclassically high power levels, and opening new venues for applications such astwo-photon spectroscopy and microscopy and optical spread spectrumcommunication.Comment: 8 pages, 7 figures. Currently under consideration at PR

Design of a high-power continuous source of broadband down-converted light