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Large second harmonic generation enhancement in Si3N4 waveguides by all-optically induced quasi-phase-matching

Author

Listed:
  • Adrien Billat

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Photonic Systems Laboratory (PHOSL))

  • Davide Grassani

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Photonic Systems Laboratory (PHOSL))

  • Martin H. P. Pfeiffer

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Laboratory of Photonics and Quantum Measurements (LPQM))

  • Svyatoslav Kharitonov

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Photonic Systems Laboratory (PHOSL))

  • Tobias J. Kippenberg

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Laboratory of Photonics and Quantum Measurements (LPQM))

  • Camille-Sophie Brès

    (Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Photonic Systems Laboratory (PHOSL))

Abstract

Efficient second harmonic generation in integrated platforms is usually achieved by resonant structures, intermodal phase-matching or quasi-phase matching by periodically poling ferroelectric waveguides. However, in all these structures, it is impossible to reconfigure the phase-matching condition in an all-optical way. Here, we demonstrate that a Watt-level laser causes a periodic modification of the second-order susceptibility in a silicon nitride waveguide, allowing for quasi-phase-matching between the pump and second harmonic modes for arbitrary wavelengths inside the erbium band. The grating is long-term inscribed, and leads to a second harmonic generation enhancement of more than 30 dB. We estimate a χ (2) on the order of 0.3 pm/V, with a maximum conversion efficiency of 0.05% W−1. We explain the observed phenomenon with the coherent photogalvanic effect model, which correctly agrees with the retrieved experimental parameters.

Suggested Citation

  • Adrien Billat & Davide Grassani & Martin H. P. Pfeiffer & Svyatoslav Kharitonov & Tobias J. Kippenberg & Camille-Sophie Brès, 2017. "Large second harmonic generation enhancement in Si3N4 waveguides by all-optically induced quasi-phase-matching," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01110-5
    DOI: 10.1038/s41467-017-01110-5
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