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High-contrast filtering by multipass diffraction between paired volume Bragg gratings.

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    High-contrast spectral and angular filtering is achieved using multiple reflections between volume Bragg gratings (VBGs). This multipass approach significantly enhances signal-to-noise ratios by suppressing out-of-band light and grating sidelobes.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Volume Bragg gratings (VBGs) offer spectral and angular selectivity.
    • Existing filtering techniques can be limited by sidelobe contributions and out-of-band spectral content.

    Purpose of the Study:

    • To demonstrate high-contrast filtering using multiple reflections between matched VBGs.
    • To enhance signal-to-noise ratios by mitigating grating sidelobes and out-of-band spectral content.
    • To achieve high suppression ratios for spectral and angular filtering applications.

    Main Methods:

    • Utilizing multiple reflections between matched volume Bragg gratings (VBGs).
    • Employing reflecting Bragg gratings (RBGs) in three different configurations for spectral filtering.
    • Using multipass transmitting gratings for angular filtering.

    Main Results:

    • Demonstrated high-contrast filtering with significantly increased suppression ratios.
    • Achieved roll-offs exceeding 150 dB/nm for spectral filters.
    • Successfully demonstrated angular filtering using multipass transmitting gratings.

    Conclusions:

    • Multipass filtering with VBGs effectively increases the suppression ratio of out-of-band light.
    • This method mitigates grating sidelobe contributions, leading to higher signal-to-noise ratios.
    • The demonstrated filters retain spectral and angular selectivity with high efficiency.