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

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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 Sep 20178 Sep 2017

Conference

Conference2nd Canterbury Conference on Optical Coherence Tomography
LocationUniversity of Kent
CountryUnited Kingdom
CityCanterbury
Period06/09/201708/09/2017
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume10591
ISSN0277-786X

Keywords

  • Ultrahigh resolution OCT
  • Dispersion compensation
  • Spectrometer calibration

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