Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 65: Laseranwendungen: Lebenswissenschaften

Q 65.6: Talk

Friday, March 6, 2009, 15:15–15:30, VMP 8 HS

Real time en face Fourier-domain optical coherence tomography with direct hardware frequency demodulation — Benjamin Biedermann, •Wolfgang Wieser, Christoph Eigenwillig, and Gesa Palte — Ludwig-Maximilians-Universität, München, Deutschland

Optical coherence tomography (OCT) is a novel method for 3d imaging of biomedical tissue. Recently, the introduction of rapidly wavelength swept Fourier-domain mode locked (FDML) lasers enabled dramatically increased imaging speeds allowing complete 3d data sets to be acquired in a second.

In contrast to the slower time-domain OCT, the extraction of en-face projections in fast swept-source OCT systems (ss-OCT) typically involves complex post-processing: data resampling, numerical spectral shaping, Fourier transformation and summation over parts of each depth scan.

This talk presents a novel cost-effective real-time en-face imaging technique using ss-OCT but without any of the mentioned computation steps: A k-space linear FDML laser combined with an adaptive feedback loop provides a spectrally-shaped swept laser source. Hardware-demodulation extracts the signal corresponding to a certain depth in the tissue.