A slow gentle waveguide has sturdy mild–matter conversation and therefore can increase the nonlinear course of action. The study from the LNPhC slow light waveguide began from the bulk LNPhC. Iliew et al. utilised a bulk LNPhC As an example that the bulk bands may be used for phase matching. https://brooksjgaul.digitollblog.com/32320848/the-single-best-strategy-to-use-for-lithium-niobate-crystal