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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Second harmonic generation in reverse proton exchanged Lithium Niobate waveguides.

A di Lallo, A Cino, C Conti

    Optics Express
    |May 7, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We achieved highly efficient second harmonic generation in proton-exchanged Lithium Niobate waveguides. This research demonstrates a significant 90% conversion efficiency for nonlinear optical applications.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science

    Background:

    • Lithium Niobate (LiNbO3) is a key material for nonlinear optical devices.
    • Proton exchange is a common technique for fabricating optical waveguides in LiNbO3.

    Purpose of the Study:

    • To investigate efficient second harmonic generation (SHG) in reverse proton-exchanged Lithium Niobate waveguides.
    • To analyze the performance of both buried and surface guides for SHG.

    Main Methods:

    • Fabrication of reverse proton-exchanged waveguides in z-cut Lithium Niobate crystals.
    • Numerical estimation of nonlinear optical conversion efficiencies.
    • Coupling analysis using the d31 nonlinear element.

    Main Results:

    • Achieved high conversion efficiencies for second harmonic generation.
    • Demonstrated efficient operation in both TM and TE polarizations.
    • Numerically estimated conversion efficiencies reached 90% in 2cm planar structures at 1.32 micrometers, with a normalized efficiency of 14% /Wcm.

    Conclusions:

    • Reverse proton exchange is an effective method for creating efficient waveguides for second harmonic generation.
    • The demonstrated efficiencies highlight the potential of these waveguides for practical nonlinear optical applications.