Chirp optical coherence tomography with high resolution and artifact reduction using tunable near-infrared laser

Dominik Hoelscher; Udo Haberland; Daniel Pieknick; Vladimir Blazek

doi:10.1117/12.306041

24 April 1998 Chirp optical coherence tomography with high resolution and artifact reduction using tunable near-infrared laser

Dominik Hoelscher, Udo Haberland, Daniel Pieknick, Vladimir Blazek

Author Affiliations +

Proceedings Volume 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II; (1998) https://doi.org/10.1117/12.306041
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

Abstract

Chirp optical coherence tomography (C-OCT) has become an alternative solution for imaging scattering media. This technique uses frequency modulated laser sources without a mechanical moving reference mirror as it is necessary in conventional coherence tomography. Images of scattering phantoms using an electrically tunable laser diode with a spatial resolution of about 400 micrometer in air had shown the capability of this tomographic principle. The new setup contains an External Cavity Laser (ECL) with a center wavelength of 780 nm. Due to the wide usable tuning range of the ECL an improved spatial resolution could be obtained compared with the electrically tunable laser diode. Having only one reflection in the object the wide bandwidth of the ECL yields a peak with the full width at half maximum less than 20 micrometers. Images of phantoms with known dimensions and scattering properties made with this arrangement are presented. Measurement of movement and motion artifacts demands special frequency modulation of the light source. Suitable methods to obtain useful information like location and velocity of moving objects as well as reducing artifacts are proposed. Combining C-OCT with Laser Doppler Perfusion Imaging (LDPI) requires conveniently prepared sweep functions.

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Dominik Hoelscher, Udo Haberland, Daniel Pieknick, and Vladimir Blazek "Chirp optical coherence tomography with high resolution and artifact reduction using tunable near-infrared laser", Proc. SPIE 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II, (24 April 1998); https://doi.org/10.1117/12.306041

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