Abstract

Several approaches have been described for generating blue light by frequency doubling near infrared laser sources in nonlinear optical materials [1]. KnbO₃ has been shown to have excellent nonlinear optical properties making it particularly attractive for nonlinear optics [2]. Thanks to its large nonlinear optical susceptibilities, its room-temperature phasematchibility between 860 nm and 980 nm by angle tuning, its transparency down to 390 nm, and its very high threshold to optical damage, KnbO₃ proved to be one of the most promising materials for high-efficiency frequency doubling of near infrared laser radiation into the blue and green spectral range [3-5].

© 1993 Optical Society of America