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Q: Fachverband Quantenoptik und Photonik

Q 62: Laseranwendungen: Lebenswiss. und Umweltphys.

Q 62.2: Vortrag

Freitag, 18. März 2011, 11:00–11:15, HÜL 386

High-speed optical coherence tomography using a Fourier domain mode locked laser — •Lars Kirsten, Julia Walther, Peter Cimalla, Sven Meissner, Mirko Mehner, and Edmund Koch — Dresden University of Technology, Faculty of Medicine Carl Gustav Carus, Clinical Sensoring and Monitoring, Fetscherstraße 74, 01307 Dresden, Germany

Optical coherence tomography (OCT) is a noninvasive imaging modality [1] generally used in medical diagnostics for 2D and 3D visualization of tissue with a spatial resolution of a few micrometers. Broadband light sources at the spectral range of 700 nm to 1500 nm are used because of low scattering and absorption in tissue resulting in a large penetration depth of typically 1 mm. The superposition of backscattered light from the sample and reference light in the interferometer generates the interference spectrum which is detected spectrally resolved in Fourier domain OCT. Multiple OCT applications suffer from motion artifacts and demand short image acquisition times especially under in vivo conditions. For achieving fast image acquisition, the principle of Fourier domain mode locking (FDML) is a suitable approach [2]. The presented FDML laser provides wavelength sweeps centered at 1300 nm and repetition rates of 50 kHz and 123 kHz, respectively. The functionality of OCT imaging is demonstrated in different biomedical applications.

[1] D. Huang et al. Science 254, 1178-1181 (1991)

[2] R. Huber et al. Optics Express 14, 3225-3237 (2006)