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Efficient wideband guided-wave acoustooptic Bragg diffraction using phased surface acoustic wave array in LiNbO(3)

L T Nguyen, C S Tsai

    Applied Optics
    |February 20, 2010
    PubMed
    Summary

    Researchers demonstrated efficient wideband acoustooptic Bragg diffraction using phased surface acoustic wave (SAW) arrays in lithium niobate waveguides. This technology achieved a 250 MHz bandwidth, significantly improving upon previous methods for light deflection.

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    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Guided-wave acoustooptic devices are crucial for light modulation and deflection.
    • Achieving wideband operation in these devices has been a significant challenge.
    • Lithium niobate (LiNbO3) is a key material for integrated optical applications.

    Purpose of the Study:

    • To demonstrate efficient wideband guided-wave acoustooptic Bragg diffraction.
    • To investigate the use of phased surface acoustic wave (SAW) arrays for enhanced bandwidth.
    • To evaluate the performance of acoustooptic deflectors with improved bandwidth and efficiency.

    Main Methods:

    • Fabrication of Y-cut LiNbO3 waveguides with phased SAW arrays.
    • Utilizing first-order acoustic beam steering with six-element phased-SAWs.
    • Measurement of Bragg condition tracking and light diffraction efficiency over a wide frequency band.

    Main Results:

    • Demonstrated accurate Bragg condition tracking over a 250 MHz frequency band.
    • Achieved 50% light diffraction with only 3.5 mW acoustic power in a larger aperture device.
    • Reported a sixfold increase in bandwidth compared to single SAW deflectors.
    • Observed very good quality for both deflected and undeflected light beams.

    Conclusions:

    • Phased SAW arrays enable efficient wideband guided-wave acoustooptic Bragg diffraction in LiNbO3 waveguides.
    • The developed devices offer significant bandwidth improvements over conventional acoustooptic deflectors.
    • This technology holds promise for advanced optical signal processing and telecommunications.