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


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 ? (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.

SUBMITTER: Billat A 

PROVIDER: S-EPMC5725590 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Large second harmonic generation enhancement in Si<sub>3</sub>N<sub>4</sub> waveguides by all-optically induced quasi-phase-matching.

Billat Adrien A   Grassani Davide D   Pfeiffer Martin H P MHP   Kharitonov Svyatoslav S   Kippenberg Tobias J TJ   Brès Camille-Sophie CS  

Nature communications 20171018 1


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 b  ...[more]

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