Photorefractive Four-Wave Mixing Switches Utilizing Pockels Effect -Longitudinal and Lateral Switches- |
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| Authors: | Imtiaz Ahmad Taj Ping Xie Kojiro Koyanagi Teruhito Mishima |
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| Institution: | (1) Communication Enabling Technologies, 5-A, Constitution Avenue, Islamabad, Pakistan;(2) Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, China;(3) Division of Electronics for Informatics, Hokkaido University, North-14, West-8, Sapporo 060-0814, Japan |
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| Abstract: | 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. |
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| Keywords: | photorefractive four-wave mixing optical switch longitudinal and lateral switches Pockels effect BaTiO3 SBN phase mismatching |
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