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Evanescent coupling in arrays of type II femtosecond laser-written waveguides in bulk x-cut lithium niobate

: Heinrich, M.; Szameit, A.; Dreisow, F.; Doering, S.; Thomas, J.; Nolte, S.; Tünnermann, A.; Ancona, A.


Applied Physics Letters 93 (2008), No.10, Art. 101111, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IOF ()

We report on the first fabrication of evanescently coupled planar arrays of type II waveguides in x-cut lithium niobate (LiNbO3) by femtosecond laser inscription. A particular choice of writing parameters allows the evanescent field of the individual waveguide modes to extend significantly beyond the damage lines into the neighboring guides, thus realizing a coupling constant of 2.2 cm(-1) at a wavelength of 633 nm. (c) 2008 American Institute of Physics.