We report the fabrication of optical channel waveguides in congruent lithium niobate single crystals by direct writing with continuous-wave ultraviolet frequency-doubled Ar<sup>+</sup> laser radiation (244 nm). The properties and performance of such waveguides are investigated, and first results are presented.
© 2003 Optical Society of America
S. Mailis, C. Riziotis, I. T. Wellington, P. G. R. Smith, C. B. E. Gawith, and R. W. Eason, "Direct ultraviolet writing of channel waveguides in congruent lithium niobate single crystals," Opt. Lett. 28, 1433-1435 (2003)