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Opt Lett. 2008 Apr 1;33(7):720-2.

Perfect quasi-phase matching for the third-harmonic generation using focused Gaussian beams.

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  • 1National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing, China.


We propose a method to realize perfect quasi-phase matching (QPM) for nonlinear optical interactions involving Gaussian beams. Using this method, both the wave-vector mismatching and the Gouy phase shift can be compensated. Numerical simulations for the third-harmonic generation show that conversion efficiency near to 100% can be realized even if the fundamental wave is tightly focused, which is difficult or even impossible with the conventional QPM method.

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