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Proceedings Paper

High-resolution imaging with advanced chirp optical coherence tomography
Author(s): Dominik Hoelscher; Claude Kemmer; Florian Rupp; Vladimir Blazek
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Paper Abstract

Chirp optical coherence tomography (Chirp OCT) has been introduced as an alternative solution for imaging scattering media or biotissues. The basic principle of Chirp OCT is well-known by the FMCW radar technique and is adapted to the optical regime. This method uses a frequency modulated laser source in the near IR frequency range. Fast imaging can be performed by an electrical tuned diode laser without the disadvantage of any mechanical moved elements but retaining the properties of optical tomographic tools for contact less, non-ionizing, non-invasive and high depth resolved scanning. The demand of high resolution imaging for media application requires a large frequency tuning range. Covering the whole lasing bandwidth of an external cavity laser by the frequency Chirp, non-linear terms as well as mode-hopping reduce the depth resolution and the dynamic range, if equidistant sampling in the time domain is performed. To restore the resolution given by the Chirp bandwidth a reference detector has been implemented, which allows the detection of mode-hopping quantitatively and the correction of the non-linearity. The reference detector can be used for real-time laser frequency measurements and offers the possibility to determine the location of discrete reflectors more accurate. Images with a high dynamic range demonstrate an increased penetration depth.

Paper Details

Date Published: 28 April 2000
PDF: 7 pages
Proc. SPIE 3915, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications IV, (28 April 2000); doi: 10.1117/12.384143
Show Author Affiliations
Dominik Hoelscher, Rheinische-Westfaelische Technische Hochschule Aachen (Germany)
Claude Kemmer, Rheinische-Westfaelische Technische Hochschule Aachen (Germany)
Florian Rupp, Rheinische-Westfaelische Technische Hochschule Aachen (Germany)
Vladimir Blazek, Rheinische-Westfaelische Technische Hochschule Aachen (Germany)

Published in SPIE Proceedings Vol. 3915:
Coherence Domain Optical Methods in Biomedical Science and Clinical Applications IV
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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