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Extended-bandwidth reflector designs by using wavelets.

W H Southwell

    Applied Optics
    |January 1, 1997
    PubMed
    Summary
    This summary is machine-generated.

    New optical interference coatings utilize wavelet refractive index groups for improved performance. These wavelets create precise stop bands without harmonics or sidelobes, enabling advanced reflector designs.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Optical interference coatings are crucial for various photonic applications.
    • Traditional designs like rugate filters can suffer from harmonic ripples and sidelobes.
    • Developing coatings with precise spectral control is an ongoing challenge.

    Purpose of the Study:

    • To introduce a novel design methodology for optical interference coatings using wavelets.
    • To demonstrate the capability of wavelets to generate harmonic-free, sidelobe-free stop bands.
    • To establish design rules for combining wavelets for extended-bandwidth reflectors.

    Main Methods:

    • Designing optical interference coatings by employing combinations of wavelets, defined as fully apodized sine-wave refractive index groups.
    • Analyzing the spectral characteristics of single wavelet structures to identify their stop band properties.

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  • Deriving rules for the combination of multiple wavelet structures to achieve desired spectral responses, specifically for extended bandwidths.

    • Main Results:

    • A single wavelet structure produces a stop band that is free of harmonics and sidelobes.
    • The derived rules enable the combination of wavelet structures for the design of extended-bandwidth reflectors.
    • This approach offers enhanced spectral control compared to traditional methods.

    Conclusions:

    • Wavelet-based design offers a powerful new method for creating optical interference coatings with superior spectral characteristics.
    • The absence of harmonics and sidelobes in wavelet-generated stop bands simplifies filter design and improves performance.
    • This technique is particularly promising for applications requiring extended bandwidths and precise spectral filtering.