Spectroscopic optical coherence tomography
This paper describes a novel technique for depth-resolved coherent backscatter spectroscopy, which is an extension of OCT technology. The system incorporates an OCT scanner illuminated by a superluminescent diode (SLD) at 1.3-μm center wavelength. In the low-coherence interferometer, a scanning reference mirror generates the temporal cross-correlation function of light reflected from the reference mirror, and that backscattered from the sample arm target. The low-coherence interferometric signal is digitally demodulated and filtered to obtain the complete complex envelope of the interferometric signal, which is required for the spectroscopic technique. Using this system, low-coherence interferograms with accurate sampling intervals and high dynamic range (>98 dB) are acquired. The probe beam of the low-coherence interferometer can be laterally scanned to generate two-dimensional data sets comprising cross-sectional images of cross-correlation amplitude and phase.
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