The optical masks prepared by using a LCLV (lliquid-crystal light valve) are first proposed for lightinduced photorefractive waveguides in photorefractive materials. Employing this technique, various waveguide structures can be fabricated, e.g., Y- or multiple-branches waveguides, fiber-like waveguides, and Mach-Zehnder-like switches, and even whole optical circuits may be formed. A Y-branches waveguide and a fiber-like waveguide were demonstrated in a LiNbO<sub>3</sub>:Fe crystal. Several technical problems, such as intensities, resolutions, writing speed, and so on, were also discussed in detail. Using a LCLV with a fast response and a writing beam with a high intensity, the waveguide structures may be changed in real time.
© 2003 Optical Society of America
Peng Zhang, Jianlin Zhao, Dexing Yang, Bili Li, Dongsheng Yang, and Xiqi Feng, "Optical masks prepared by using a liquid-crystal light valve for light-induced photorefractive waveguides," Appl. Opt. 42, 4208-4211 (2003)