Phase-matched optical second-harmonic generation in Langmuir–Blodgett film waveguides by mode conversion

Authors

  • Dr. Mathias Flörsheimer,

    Corresponding author
    1. Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
    • Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
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  • Munfred Küpfer,

    1. Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
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  • Dr. Christian Bosshard,

    1. Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
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  • Dr. Herbert Looser,

    1. Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
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  • Prof. Peter Günter

    1. Nonlinear Optics Laboratory, Institute of Quantum Electronics Swiss Federal Institute of Technology ETH-Hon̈ggerberg, CH-8093 Zürich (Switzerland)
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  • We acknowledge Dr. Q. Tang and Dr. S. Zahir (Ciba-Geigy AG, Basel, Switzerland) for the synthesis and C. Masoni and Prof. R. Deschenaux (University of Neuchitel, Switzerland) for the purification of DCANP. Additionally we thank Dr. P. Herrmann (ASI AG, Zürich) for helpful discussions. This work has been supported in part by the Swiss National Science Foundation (projects NFP 19 and NFP 24).

Abstract

Phase-matched second-harmonk light generation by guided mode conversion has been observed for the first time in nonlinear optically active Langmuir-Blodgett films. The sketch of the experimental setup (Figure) shows how the infrared fundamental beam is coupled via a grating into SiO2/TiO2-DCNAP waveguides with various thicknesses of DCNAP film. The film with the correct thickness for phase matching guides a second-harmonic mode, which is observed as a blue beam, as illustrated in a photograph in the article.

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