Quasi-Phase-Matched Third-Harmonic Generation in a Quasi-Periodic Optical Superlattice

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Science  31 Oct 1997:
Vol. 278, Issue 5339, pp. 843-846
DOI: 10.1126/science.278.5339.843

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Quasi-periodic structure can be introduced into nonlinear optical materials such as LiTaO3 crystals. Such structures were used for quasi–phase-matching second-harmonic generation. These materials are now shown to be able to couple second-harmonic generation and sum-frequency generation through quasi–phase-matching. The approach led to a direct third-harmonic generation with high efficiency through a coupled parametric process. The result verifies that high-order harmonics may be generated in a quadric nonlinear medium by a number of quasi–phase-matching processes, and therefore, exhibits a possible important application of quasi-periodic structure materials in nonlinear optics.

  • * These authors contributed equally to this work.

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