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Optical waveguiding and cut-off modulation have been observed in a structure based on KNbO3 single crystals. The refractive index changes induced by the electro-optic coefficient r33=64 pm/V allow waveguiding for a voltage of about 20 V. Guided modes have been measured in the wavelength range 0.5–1.3 μm.
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Baumert et al. (1985) studied this question.
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