A sluggish light waveguide has powerful mild–make a difference interaction and thus can enhance the nonlinear method. The study from the LNPhC slow mild waveguide started from the bulk LNPhC. Iliew et al. used a bulk LNPhC As an instance that the bulk bands can be used for stage matching. https://lithium-niobate-crystal91245.weblogco.com/32725638/getting-my-lithium-niobate-crystal-to-work