Usually, the development of WGM microresonators for built-in lithium niobate photonics is accompanied by the development of the LNOI preparing system. In the early stage, z-cut LN films have been usually selected due to the limitations of lithographic methods. Keywords and phrases: lithium niobate slender movies; crystal lattice; domain inversion https://lithium-niobate-crystal50505.thelateblog.com/32987545/5-easy-facts-about-lithium-niobate-crystal-described