Abstract
Optical coherence tomography (OCT) is an emerging technique for micron-scale cross-sectional imaging of biological tissue. OCT is analogous to ultrasound imaging except that it uses low coherence light instead of sound waves.’ High resolution detection of reflected or backscattering light is performed using low coherence interferometery. High nonlinearity, air- silica microstructure fibers2 or tapered fibers3 can generate an extremely broadband continuum using low energy femtosecond pulses. This is achieved by the anomalous dispersion characteristics of the fibers which shift the zero dispersion wavelength to shorter wavelengths and small core diameters which provide a tight mode confinement. We recently demonstrated ultrahigh resolution OCT using an air-silica microstructure fiber as light source in the spectral region between 1.2 µm and 1.5 µm with an axial resolution of 2.5 µm at 1.3 µm center wavelength.4
© 2001 Optical Society of America
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