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Broadband monolithic acousto-optic tunable filter.

H Gnewuch, N K Zayer, C N Pannell

    Optics Letters
    |December 7, 2007
    PubMed
    Summary
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    Researchers developed broadband acousto-optic tunable filters using lithium niobate. These filters offer efficient optical tuning across a wide wavelength range, demonstrating potential for advanced photonic applications.

    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Investigates broadband monolithic acousto-optic tunable filters (AOTFs).
    • Combines piezoelectric transducer array and acousto-optic interaction medium in a single crystal.
    • Focuses on devices fabricated using domain inversion in Lithium Niobate (LiNbO3).

    Purpose of the Study:

    • To explore the performance of AOTFs with a linearly chirped acoustic superlattice.
    • To achieve a wide optical tuning range for AOTFs.
    • To characterize spectral bandwidths and conversion efficiencies.

    Main Methods:

    • Fabrication of a linearly chirped acoustic superlattice via domain inversion in LiNbO3.
    • Excitation of X-propagating longitudinal acoustic waves using a crossed-field scheme with an RF E(y) field.

    Related Experiment Videos

  • Coupling of collinearly propagating e- and o-polarized optical modes.

    • Main Results:

    • Achieved an optical tuning range of lambda = 1.3-1.6 µm.
    • Measured spectral bandwidths (FWHM) of 1.54 nm at 1.319 µm and 2.3 nm at 1.55 µm.
    • Obtained a relative conversion efficiency of 43%/W and a maximum conversion efficiency of 51% at 1.319 µm.

    Conclusions:

    • Demonstrated the feasibility of broadband monolithic AOTFs with a chirped superlattice structure.
    • Highlighted the potential of LiNbO3 for creating tunable filters with significant optical bandwidth.
    • Confirmed efficient acousto-optic mode conversion across the investigated wavelength range.