Third-harmonic generation in silica wedge resonators

Whispering-gallery-mode microcavities are known to have a high optical quality factor, making them suitable for nonlinear optical interactions. Here, third-harmonic generation is observed using a relatively small radius wedge silicon oxide optical microcavity. The small radii wedge microdisks can be...

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Veröffentlicht in:Journal of the Optical Society of America. B, Optical physics Optical physics, 2023-06, Vol.40 (6), p.1407
Hauptverfasser: Soares, Jorge H., Fujii dos Santos, Laís, Santos, Felipe G. S., Inga, Marvyn, Espinel, Yovanny A. V., Wiederhecker, Gustavo S., Alegre, Thiago P. Mayer
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Sprache:eng
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Zusammenfassung:Whispering-gallery-mode microcavities are known to have a high optical quality factor, making them suitable for nonlinear optical interactions. Here, third-harmonic generation is observed using a relatively small radius wedge silicon oxide optical microcavity. The small radii wedge microdisks can be dispersion-tailored to obtain either normal or anomalous group velocity dispersion. In our case, we operated in the normal dispersion regime preventing frequency comb generation by suppressing IR cascading four-wave mixing. This approach allowed for a clean third-harmonic generation at phase-matched visible optical modes. Tunability of the third-harmonic emission was obtained due to a combination of thermo-optical and Kerr effects. An additional thermal control of the phase-matching condition allows the optimization of the third-harmonic generation, and an agreement between this process and the couple-mode theory was demonstrated.
ISSN:0740-3224
1520-8540
DOI:10.1364/JOSAB.482611