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We report on double-resonant highly efficient sum-frequency generation in theblue range. The system consists of a 10-mm-long periodically poled KTP crystalplaced in a double-resonant bow-tie cavity and pumped by a fiber laser at1064.5 nm and a Ti:sapphire laser at 849.2 nm. An optical power of 375 mW at472.4 nm in a TEM$_{00}$ mode was generated with pump powers of 250 mW at 849.2nm and 200 mW at 1064.5 nm coupled into the double-resonant ring resonator with88$\%$ mode-matching. The resulting internal conversion efficiency of 95($\pm3$)$\%$ of the photons mode-matched to the cavity constitutes, to the best ofour knowledge, the highest overall achieved quantum conversion efficiency usingcontinuous-wave pumping. Very high conversion efficiency is rendered possibledue to very low intracavity loss on the level of 0.3$\%$ and high nonlinearconversion coefficient up to 0.045(0.015) W$^{-1}$. Power stabilitymeasurements performed over one hour show a stability of 0.8$\%$. The generatedblue light can be tuned within 5 nm around the center wavelength of 472.4 nm,limited by the phase-matching of our nonlinear crystal. This can however beexpanded to cover the entire blue spectrum (420 nm to 510 nm) by proper choiceof nonlinear crystals and pump lasers. Our experimental results agree very wellwith analytical and numerical simulations taking into account cavity impedancematching and depletion of the pump fields.

Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency