[OPTICAL REVIEW Vol. 11, No. 5 (2004) 332-336]
© 2004 The Optical Society of Japan

Photorefractive Four-Wave Mixing Switches Utilizing Pockels Effect—Longitudinal and Lateral Switches—

Imtiaz Ahmad TAJ, Ping XIE1, Kojiro KOYANAGI2 and Teruhito MISHIMA2

Communication Enabling Technologies, 5-A, Constitution Avenue, Islamabad, Pakistan
1Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
2Division of Electronics for Informatics, Hokkaido University, North-14, West-8, Sapporo 060-0814, Japan

(Received June 23, 2003; Accepted May 24, 2004)

We carried out detailed calculations for photorefractive wave-mixing switches based on one of three crystals with high electro-optic coefficients, namely, BaTiO3, Strontium Barium Niobate (SBN (0.75)), and Potasium Sodium Strontium Barium Niobate (KNSBN). A comparison of results for the three crystals shows that a 0°-cut BaTiO3 crystal is suitable for a longitudinal switch and requires a voltage of about 80 for a 2-mm-thick crystal to induce sufficient phase mismatch. The electrodes must be transparent for the incident and diffracted beams. A 45°-cut SBN (0.75) crystal, however, is suitable for a lateral switch and requires a voltage of about 150 for a 1-mm-wide crystal. The electrodes do not need to be transparent.

Key words: photorefractive, four-wave mixing, optical switch, longitudinal and lateral switches, Pockels effect, BaTiO3, SBN, phase mismatching