A technique for fabricating optical waveguides in a lithium niobate crystal is studied experimentally. We fabricate straight and curved structures of refractive index as the optical waveguides in a volume of the photorefractive crystal by scanning a focused laser beam. The experimental results show that the structure of refractive-index distribution is complex yet imply guiding of light in the part of high refractive index within the fabricated structure.
© 1994 Optical Society of America
Original Manuscript: December 7, 1993
Published: May 1, 1994
Kazuyoshi Itoh, Osamu Matoba, and Yoshiki Ichioka, "Fabrication experiment of photorefractive three-dimensional waveguides in lithium niobate," Opt. Lett. 19, 652-654 (1994)