Low-threshold spatial solitons in reverse-proton-exchanged periodically poled lithium niobate waveguides

Combining reverse proton exchange and uniform periodic poling in LiNbO3 planar waveguides, we demonstrate low-energy spatial optical solitons by second-harmonic generation at room temperature, with a threshold as low as 23 pJ/mum at 1.5 mum. (C) 2004 Optical Society of America.