Abstract
The improved range Doppler algorithm is proposed to abate the trade-off
between resolutions and depth of focus in spectral domain optical coherence
tomography. By considering the finite beam width and the shape of the wavefronts
produced by the Gaussian beam, a physical diffraction model is presented to simulate
the light propagation process in the sample. The two-dimensional processing of the
spectrum data is decomposed into two one-dimensional processings of Stolt transform
and matched filter. Experimental results show that image reconstruction can be
achieved. The transverse and axial resolutions are both improved significantly,
especially in the out-of-focus range, and the resolutions are almost equivalent
throughout the entire region of interest.
© 2011 Chinese Optics Letters
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