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Description
Potassium tantalate niobate (KTN) is a paraelectric perovskite crystal with a strong quadratic electro-optic effect near its Curie temperature, making it a promising material for high-speed optical beam deflection*. Electrode design strongly influences the electric-field uniformity, drive voltage, fringe fields, and dielectric-breakdown risk in KTN deflectors. Based on electrostatic simulations using COMSOL Multiphysics and CST Studio Suite for a KTN crystal of dimensions 5 mm × 5 mm × 0.5 mm, parallel-plate electrodes provide the most uniform electric field, whereas alternative geometries generate strong fringing fields and substantial nonuniformity. These results provided practical guidance for building a prototype of a KTN-based electro-optic deflector using silver electrodes. We present preliminary results characterizing the performance of the prototype KTN deflector.
Funding Agency
This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science and is based on work supported by the U.S. DOE Office of Science-Basic Energy S
Footnotes
- W. Zhu, J. Chao, C. Chen, S. Yin, R. C. Hoffman, ``Three order increase in scanning speed of space charge-controlled KTN deflector by eliminating electric field induced phase transition in nanodisordered KTN,'' Scientific Reports, September 2016.
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