Quasi phase matching in femtosecond pulse volume structured x-cut lithium niobate

Authors

  • Jens Thomas,

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    • Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
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  • Vinzenz Hilbert,

    1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
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  • Reinhard Geiss,

    1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
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  • Thomas Pertsch,

    1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
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  • Andreas Tünnermann,

    1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
    2. Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany
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  • Stefan Nolte

    1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany
    2. Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany
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Corresponding authors: e-mail: thomas@iap.uni-jena.de

Abstract

All optical inscription of quasi phase matching structures in an x-cut LiNbO3 crystal is demonstrated. Quasi phase matching is obtained by periodically lowering the nonlinear refractive index of the crystal using focussed ultrashort pulses. The structures were used to frequency double 1.55 µm light. The converted signal could be enhanced by a factor of 70 with respect to the unmodified material. From these measurement it could be deduced that the nonlinearity has been periodically damped up to 20%.

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