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We generate a 200-nm optical frequency comb at 1.5 microns by injecting twosingle-frequency lasers into a highly nonlinear fiber, and explore its spectralphase properties and high power to demonstrate full nonlinear conversion intoits second harmonic. Combs of optical frequencies with 100-nm (~ 48 THz)bandwidths, centered at 790-800 nm and spaced by 0.8-1 nm (380-470 GHz) wereproduced by second harmonic and multiple sum frequency generation simply byfocusing into a 2-mm long nonlinear crystal. Conventional birefringence phasematching was used in normal incidence configuration without tilting thecrystal.

Full Nonlinear Conversion of Broadband Frequency Combs generated by Four-Wave Mixing in Highly Nonlinear Fibers