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Related Experiment Video

Updated: Jun 16, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Cross-correlation discrimination for optical cavity modes.

C C Aleksoff, B D Guenther

    Applied Optics
    |February 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed matched spatial filters for spherical Fabry-Perot interferometers (FPSI). This technique effectively discriminates between interferometer modes, enhancing signal clarity and maintaining a full free spectral range.

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    Published on: August 12, 2013

    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Signal Processing

    Background:

    • Spherical Fabry-Perot interferometers (FPSI) support various spatial modes.
    • Distinguishing between these modes is crucial for precise optical measurements.
    • Existing methods may lack efficiency in mode discrimination.

    Purpose of the Study:

    • To develop and validate matched spatial filters for FPSI modes.
    • To experimentally and theoretically investigate mode orthogonality and cross-correlation.
    • To establish a method for discriminating against unwanted modes in FPSI systems.

    Main Methods:

    • Construction of matched spatial filters tailored to specific FPSI modes.
    • Experimental and theoretical calculation of cross-correlation between interferometer modes.
    • Definition and analytical evaluation of a discrimination function for Gaussian modes.

    Main Results:

    • Demonstrated orthogonality between various FPSI modes.
    • Validated the use of matched filters for effective mode discrimination.
    • Showed that discrimination strength can be adjusted at the cost of signal strength.
    • Experimentally confirmed stable operation of a scanning FPSI with a single zero-order mode filter.

    Conclusions:

    • Matched spatial filtering is a viable technique for mode discrimination in FPSI.
    • The developed method allows for selective filtering of interferometer modes.
    • This approach maintains a full free spectral range across a wide range of cavity spacings.