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Electro-optic potassium-tantalate-niobate films prepared by pulsed laser deposition from segmented pellets

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Abstract

Thin films of potassium tantalate niobate (KTN) were prepared by means of pulsed excimer-laser deposition and investigated with a number of analytical techniques, including electrical and electro-optical measurements. For applications in longitudinal electro-optic modulators, a transparent electrode is required between substrate and electro-optic layers. Suitable electrode materials, which at the same time permit epitaxial growth of KTN, were identified and prepared. The resulting layered samples were not only of good epitaxial and optical quality, but also exhibited the expected maximum of the longitudinal electro-optic effect at temperatures between the phase transitions from cubic to tetragonal and from tetragonal to orthorhombic. However, the maximum achievable electro-optic phase shift was found to be limited to roughly τ/100 for KTN films in the thickness range around 1 μm. Therefore, much thicker films are probably necessary for most practical applications, which requires significant improvements in the long-term stability and homogeneity of the deposition process.

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Author notes

  1. S. Yilmaz

    Present address: Permanent address: Heinrich-Hertz-Institut für Nachrichtentechnik, Berlin GmbH, Einsteinufer 37, D-1000, Berlin 10, Germany

  2. T. Sands

    Present address: Present address: Department of Materials Science and Mineral Engineering, University of California, California, 94720, Berkeley, USA

  3. T. Venkatesan

    Present address: Present address: Center for Superconductivity Research, Department of Physics, University of Maryland, Maryland, 20742, College Park, USA

Authors and Affiliations

  1. Bell Communications Research, New Jersey, 07701-7020, Red Bank, Germany

    S. Yilmaz, W. A. Bonner, D. M. Hwang, A. Inam, J. A. Martinez, T. S. Ravi, T. Sands, B. J. Wilkens, X. D. Wu & T. Venkatesan

  2. Heinrich-Hertz-Institut für Nachrichtentechnik, Einsteinufer 37, D-1000 Berlin 10, Berlin GmbH, Germany

    R. Gerhard-Multhaupt

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  1. S. Yilmaz
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Yilmaz, S., Gerhard-Multhaupt, R., Bonner, W.A. et al. Electro-optic potassium-tantalate-niobate films prepared by pulsed laser deposition from segmented pellets. Journal of Materials Research 9, 1272–1279 (1994). https://doi.org/10.1557/JMR.1994.1272

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  • DOI: https://doi.org/10.1557/JMR.1994.1272

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