Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 39: Laser in der Medizin

Q 39.1: Gruppenbericht

Donnerstag, 27. März 2003, 14:00–14:30, F107

Ti:sapphire channel-waveguide broadband light sources for optical coherence tomography — •Markus Pollnau1, Aurelian Crunteanu1, Laetitia Laversenne1, Simon Rivier1, Christos Grivas2, David P. Shepherd2, and Robert W. Eason21Applied Photonics Laboratory, Institute for Biomedical Imaging, Optics, and Engineering, Swiss Federal Institute of Technology Lausanne, Switzerland — 2Optoelectronics Research Centre, University of Southampton, United Kingdom

We report on the fabrication of Ti:sapphire active channel waveguides. We created up to 5-µm high ribs in 10-µm thick Ti:sapphire planar waveguides by reactive ion etching or ion milling. Following excitation by a green laser, the rib structures showed fundamental-mode channel-waveguide fluorescence emission with up to 310 µW output power. Such devices are of interest as broadband light sources in low-coherence interferometry. The higher confinement and significantly improved output power over Ti:sapphire bulk structures ensures efficient coupling to single-mode fiber interferometers and provides a better signal-to-noise ratio. Ultrahigh-resolution optical coherence tomography (OCT) is demonstrated. Ti:sapphire channel-waveguide superluminescent light sources provide a simple and robust alternative to femtosecond lasers for ultrahigh-resolution OCT imaging.

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DPG-Physik > DPG-Verhandlungen > 2003 > Hannover