We report a continuous-wave tunable optical parametric oscillator (OPO) which is intra-cavity pumped by a laser diode (LD) end-pumped Nd:YVO4 laser and utilize a periodically-poled lithim niobate (PPLN) crystal as nonlinear medium. Cavities are carefully designed and intra-cavity pumping schemes are adopted to realize continuous-wave operation. 1406～1513 nm signal output and 3.66～4.1 μm mid-infrared idler output are obtained with the maximum power of 820 mW at 1500 nm and 195 mW at 3.86 μm, corresponding conversion efficiencies versus 10.9 W LD power are 7.5% and 1.8%. 606～624 nm continuous-wave tunable orange-red output is also obtained by intra-cavity sum-frequency generating of 1064 nm pump wave and 1.4～1.5 μm signal wave of the OPO in a BBO crystal. The maximum output power is 120 mW at 624 nm, with conversion efficiency of 1.1%.