A technique for incorporating a groove into a LiNbO<sub>3</sub> substrate is described. Both V grooves for fiber alignment and vertical grooves for waveguide end-face formation can be fabricated with this technique. The proposed fabrication method is based on an excimer-laser ablation and a high-speed rotation saw cut for LiNbO<sub>3</sub> . The former process provides a variety of cross-sectional groove shapes by changing the ablation mask shape of LiNbO<sub>3</sub> , and the latter provides an optical-quality cutting face. The proposed fabrication method is simple and provides low-cost optical platforms not only for LiNbO<sub>3</sub> but also for glasses, polymers, and semiconductors.
© 1998 Optical Society of America
Tadashi Ichikawa, Manabu Kagami, and Hiroshi Ito, "LiNbO3 platforms for optical fiber alignment," Opt. Lett. 23, 1138-1140 (1998)