400%/W second harmonic conversion efficiency in $14\mu \mathrm{m}$-diameter gallium phosphide-on-oxide resonators

Alan D. Logan, Michael Gould, Emma R. Schmidgall +7

Second harmonic conversion from 1550~nm to 775~nm with an efficiency of 400% W${}^{-1}$ is demonstrated in a gallium phosphide (GaP) on oxide integrated photonic platform. The platfo…