Resolution dependence on phase extraction by the Hilbert transform in phase calibrated and dispersion compensated ultrahigh resolution spectrometer-based OCT

Niels Møller Israelsen, Michael Maria, Thomas Feuchter, A. Bradu, Adrian Podoleanu, Ole Bang

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    553 Downloads (Pure)

    Abstract

    Ultrahigh resolution optical coherence tomography (UHR-OCT) is enabled by using a broad band source. Simultaneously, this makes the OCT image more sensitive to dispersion mismatch in the interferometer. In spectral domain OCT, dispersion left uncompensated in the interferometer and detector non-linearities lead together to an unknown chirp of the detected interferogram. One method to compensate for the chirp is to perform a pixel-wavenumber calibration versus phase that requires numerical extraction of the phase. Typically a Hilbert transform algorithm is employed to extract the optical phase versus wavenumber for calibration and dispersion compensation. In this work we demonstrate UHR-OCT at 1300 nm using a Super continuum source and highlight the resolution constraints in using the Hilbert transform algorithm when extracting the optical phase for calibration and dispersion compensation. We demonstrate that the constraints cannot be explained purely by the numerical errors in the data processing module utilizing the Hilbert transform but must be dictated by broadening mechanisms originating from the experimentally obtained interferograms.
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    Number of pages6
    Volume10591
    PublisherSPIE - International Society for Optical Engineering
    Publication date2018
    Article number105910D
    ISBN (Print)9781510616745
    DOIs
    Publication statusPublished - 2018
    Event2nd Canterbury Conference on Optical Coherence Tomography: Emphasis on broadband sources - University of Kent, Canterbury, United Kingdom
    Duration: 6 Sept 20178 Sept 2017
    Conference number: 2

    Conference

    Conference2nd Canterbury Conference on Optical Coherence Tomography
    Number2
    LocationUniversity of Kent
    Country/TerritoryUnited Kingdom
    CityCanterbury
    Period06/09/201708/09/2017
    SeriesProceedings of SPIE - The International Society for Optical Engineering
    ISSN0277-786X

    Keywords

    • Ultrahigh resolution OCT
    • Dispersion compensation
    • Spectrometer calibration

    Fingerprint

    Dive into the research topics of 'Resolution dependence on phase extraction by the Hilbert transform in phase calibrated and dispersion compensated ultrahigh resolution spectrometer-based OCT'. Together they form a unique fingerprint.

    Cite this