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Related Experiment Video

Updated: Jun 22, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Uniform response high resolution tunable optical filtering using a grating-assisted acousto-optic device.

David Bitauld, Isabelle Zaquine, Alain Maruani

    Optics Express
    |June 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    A novel filtering technique combines reflection gratings and acousto-optic cells for rapid, uniform wavelength tuning. This method achieves high wavelength selectivity and consistent diffraction efficiency across a tunable range.

    Area of Science:

    • Photonics and Optical Engineering
    • Acousto-Optics
    • Diffractive Optics

    Background:

    • Standard reflection gratings offer high dispersion but limited tuning speed.
    • Acousto-optic (AO) cells provide fast tuning but typically lack high spectral resolution.
    • Integrating these technologies presents a challenge for achieving both speed and selectivity.

    Purpose of the Study:

    • To propose and demonstrate a new optical filtering technique that leverages the strengths of both reflection gratings and acousto-optic cells.
    • To achieve rapid and uniform wavelength tuning with high spectral resolution.
    • To explore the potential for enhanced performance with optimized AO cell design.

    Main Methods:

    • A novel filtering architecture associating the high dispersion of reflection gratings with the tuning speed of acousto-optic cells.

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  • Wavelength tuning achieved by adjusting the grating period to maintain Bragg resonance for the selected wavelength.
  • Utilizing a commercial acousto-optic modulator for experimental validation.

    • Main Results:

    • Demonstrated a wavelength selectivity of 0.075 nm.
    • Achieved a uniformity of +/-0.2 dB over a tuning range of 2.2 nm.
    • Obtained N = 30 resolvable frequencies with the commercial setup, with potential for N > 600 using a custom AO cell.

    Conclusions:

    • The proposed filtering technique effectively combines high dispersion and fast tuning capabilities.
    • The method ensures maximum diffraction efficiency and good uniformity for selected wavelengths.
    • Optimized acousto-optic cell design holds promise for significantly increasing the number of resolvable frequencies.