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Article

Channel Waveguides in Lithium Niobate and Lithium Tantalate

MQ Photonics, Department of Physics, Macquarie University, Sydney, NSW 2109, Australia
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Author to whom correspondence should be addressed.
Academic Editors: Nikolay I. Leonyuk, Victor V. Mal’tsev and M.-H. Whangbo
Molecules 2020, 25(17), 3925; https://doi.org/10.3390/molecules25173925
Received: 16 July 2020 / Revised: 19 August 2020 / Accepted: 25 August 2020 / Published: 27 August 2020
(This article belongs to the Special Issue Crystallography and Crystal Chemistry)
Low-loss photonic waveguides in lithium niobate offer versatile functionality as nonlinear frequency converters, switches, and modulators for integrated optics. Combining the flexibility of laser processing with liquid phase epitaxy we have fabricated and characterized lithium niobate channel waveguides on lithium niobate and lithium tantalate. We used liquid phase epitaxy with K2O flux on laser-machined lithium niobate and lithium tantalate substrates. The laser-driven rapid-prototyping technique can be programmed to give machined features of various sizes, and liquid phase epitaxy produces high quality single-crystal, lithium niobate channels. The surface roughness of the lithium niobate channels on a lithium tantalate substrate was measured to be 90 nm. The lithium niobate channel waveguides exhibit propagation losses of 0.26 ± 0.04 dB/mm at a wavelength of 633 nm. Second harmonic generation at 980 nm was demonstrated using the channel waveguides, indicating that these waveguides retain their nonlinear optical properties. View Full-Text
Keywords: lithium niobate; laser processing; crystalline waveguide; liquid phase epitaxy lithium niobate; laser processing; crystalline waveguide; liquid phase epitaxy
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MDPI and ACS Style

Lu, Y.; Johnston, B.; Dekker, P.; Withford, M.J.; Dawes, J.M. Channel Waveguides in Lithium Niobate and Lithium Tantalate. Molecules 2020, 25, 3925. https://doi.org/10.3390/molecules25173925

AMA Style

Lu Y, Johnston B, Dekker P, Withford MJ, Dawes JM. Channel Waveguides in Lithium Niobate and Lithium Tantalate. Molecules. 2020; 25(17):3925. https://doi.org/10.3390/molecules25173925

Chicago/Turabian Style

Lu, Yi, Benjamin Johnston, Peter Dekker, Michael J. Withford, and Judith M. Dawes. 2020. "Channel Waveguides in Lithium Niobate and Lithium Tantalate" Molecules 25, no. 17: 3925. https://doi.org/10.3390/molecules25173925

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