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. 2018 Jan 12;7:17126. doi: 10.1038/lsa.2017.126

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CW pumped SHG from a mono-layer GaSe integrated with a PC cavity. (a) AFM image of the GaSe-PC cavity, indicating GaSe’s thickness of ~0.89 nm. (b) Spectrum of the cavity’s upconversion signals pumped with a 1548.8 nm CW laser, showing SHG and THG signals. (c) Cavity-enhanced SHG spectrum when the pump wavelength is tuned cross the resonance, where the dashed line is a squared Lorentzian fitting curve of the cavity resonant mode. (d) Polarization-dependence of the cavity-enhanced SHG.