Procedure for the manufacture of optical wave guides for the ordinary refractive index of LiNbO3.

摘要

Procedure for the manufacture of optical wave guides for the ordinary refractive index of Lithium Niobate by means of a double ion exchange. A layer several microns thick is generated with an initial deep proton exchange, from which a certain fraction of the lithium ions has been extracted from the material, causing a reduction in the ordinary index of approximately n [approximately equals] 0.04 (Fig. 1). With a second, less deep exchange than the first, in a lithium-rich solution, the lithium ions are re-introduced and the ordinary index approximately recovers its initial value in a layer less than the first. This last layer together with the rest of the previous layer which forms the actual substrate, constitutes the wave guide (Fig. 2). The wave guide finally has a jump in the ordinary index of n [approximately equals] 0.03 for = 0.6328 m. IMAGE