Data of Isotropic fabrication of centimeter-scale, low propagation-loss periodically pole lithium niobate nanophotonic waveguides for efficient second harmonic generation

The datasets include the evolution curve of second-harmonic intensity versus wavelength in the range of 760 nm to 765 nm directly acquired by the spectrometer, the curve of second-harmonic conversion efficiency as a function of pump power, as well as the second-harmonic spectral data measured at pump powers of 50.93 mW and 86.09 mW.