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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Updated: Jun 20, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
08:31

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Published on: May 3, 2011

Integrated-optic acoustically tunable reflection filter.

D A Smith, J J Johnson, J E Baran

    Optics Letters
    |September 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed an integrated-optic, acoustically tunable filter using a double-pass design. This novel approach significantly enhances sidelobe suppression and reduces filter bandwidth for improved optical performance.

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    Area of Science:

    • Photonics
    • Acousto-Optics
    • Integrated Optics

    Background:

    • Acousto-optic filters are crucial for wavelength selection in optical systems.
    • Achieving high sidelobe suppression and narrow bandwidth in single-stage acousto-optic filters is challenging.
    • Existing methods like cascaded filters are complex and difficult to fabricate.

    Purpose of the Study:

    • To demonstrate a novel two-stage, integrated-optic, acoustically tunable filter.
    • To improve sidelobe suppression and reduce filter bandwidth compared to single-stage devices.
    • To offer a simpler fabrication alternative to cascaded acousto-optic filters.

    Main Methods:

    • An integrated-optic acousto-optic filter was designed.
    • A double-pass configuration was implemented using an integral mirror to reflect light back through the filter.
    • The performance of the double-pass filter was evaluated for sidelobe suppression and bandwidth.

    Main Results:

    • The double-pass configuration achieved sidelobe suppression of approximately -20 dB.
    • A 72% reduction in filter bandwidth was observed, reaching less than 0.9 nm at 1.52 microm.
    • The performance was comparable to cascaded acousto-optic filters.

    Conclusions:

    • The demonstrated two-stage, double-pass acousto-optic filter offers superior performance in sidelobe suppression and bandwidth reduction.
    • This integrated-optic device provides a simpler and potentially more cost-effective solution compared to traditional cascaded filters.
    • The findings suggest a promising new design for tunable optical filters in various photonic applications.