Abstract
The waveguide beam splitters with diverse configurations in LiNbO3 crystal have been produced by direct femtosecond laser writing of a family of optical-lattice-like cladding structures. By on demand design of the lattice tracks with “defect” lines, the efficient beam guiding and tailoring have been implemented in the structures. With a family of three-element integration of structures, three-dimensional (3-D)
$1 \times 3$
beam splitting at the telecommunication wavelength of 1550 nm was realized. Different from the Type I modification of LiNbO3 waveguides, the guiding cores of the optical-lattice-like cladding waveguide structures we fabricated locate in regions that are surrounded by the laser-induced-tracks. This paper opens the alternative way to construct complex integrated platforms in LiNbO3 crystal by using femtosecond laser writing.
© 2016 IEEE
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