Planar optical waveguides have been formed in strontium barium niobate single crystals by either proton or helium-ion implantation. The profiles of the ordinary and the extraordinary refractive indices are deduced from dark-line mode spectroscopy. Optical barriers with depths to Δne = 2.6% for protons and Δne = 5.5% for helium are obtained. By proton implantation we find a very low intensity loss of 0.4 cm−1 for ordinarily and a higher value of 2.7 cm−1 for extraordinarily polarized light at 632.8 nm. For helium-implanted waveguides both values are ~4 cm−1.
© 1995 Optical Society of America
Original Manuscript: February 15, 1995
Published: June 1, 1995
D. Kip, P. Moretti, and S. Aulkemeyer, "Low-loss planar optical waveguides in strontium barium niobate crystals formed by ion-beam implantation," Opt. Lett. 20, 1256-1258 (1995)