The first planar optical waveguide to the authors’ knowledge has been formed in Cu-doped potassium sodium strontium barium niobate crystal by mega-electron-volt He+ implantation. Both TE and TM modes are observed. The profiles of the ordinary and the extraordinary refractive indices are deduced from dark-line mode spectroscopy. The results show that the mega-electron-volt He implantation results in a decrease in refractive index in barriers for both no and ne, but for ne there is an obvious increase in the waveguide region. From an experiment in photorefractive two-wave mixing, it is found that the erasure time for two-wave mixing is prolonged by ion implantation.
© 1997 Optical Society of America
[Optical Society of America ]
Fei Lu, Ming-Qi Meng, Ke-Ming Wang, Xiang-Dong Liu, Huan-Chu Chen, and Ding-Yu Shen, "Planar optical waveguide in Cu-doped potassium sodium strontium barium niobate crystal formed by mega-electron-volt He-ion implantation," Opt. Lett. 22, 163-165 (1997)