There are fundamentally two achievable good reasons with the productive refractive index variation on mild irradiation: heating of the LiNbO3:Fe substrates and, As a result, from the LC in the microchannel, and director reorientation in the electric discipline induced by light from the LiNbO3:Fe substrates. Keywords: lithium niobate slim films; https://lithium-niobate-crystal52841.nizarblog.com/32597639/facts-about-lithium-niobate-crystal-revealed