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(a) Finite elements simulation of the extraordinary refractive index distribution in a type II array. [(b) and (c)] Corresponding calculated intensity profiles of two adjacent waveguide modes within the array. (d) Normalized integrand of Eq. (1).
Femtosecond laser inscription of a type II waveguide array in bulk -cut lithium niobate. Inset: Micrograph of an array’s end facet.
(a) Micrograph of the investigated type II waveguide array. Measured intensity distributions at 633 nm and according simulations for excitation of the [(b) and (c)] fifth, [(d) and (e)] first, and [(f) and (g)] second waveguides. The respective excited waveguides are marked by circles, while the dashed lines indicate the positions of the damage lines.
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