The axial resolution is an important parameter in Optical Coherence Tomography (OCT). In OCT a broadband light source is used to achieve high axial resolution imaging. However the dispersion results in a broadening of the coherence envelope. The dispersion mismatch between reference and sample arms then needs to be minimized to achieve optimal axial resolution for OCT. In this work we propose a new numerical dispersion compensation method to obtain ultrahigh resolution in SDOCT, in which wavelet transform instead of Fourier transform is used to obtain the signal in different frequency domain. And a series of the phase signals of different interfaces of the sample can be obtained. Under the homogeneous medium approxiamtion, the phase signal is a linear function of the wave number. Thus based on linearization of the phase signal of different interface and the wave number, the axial resolution can be improved.

Date Published: 16 September 2014
PDF: 8 pages
Proc. SPIE 9236, Scanning Microscopies 2014, 92360X (16 September 2014); doi: 10.1117/12.2065309

Published in SPIE Proceedings Vol. 9236:
Scanning Microscopies 2014
Michael T. Postek; Dale E. Newbury; S. Frank Platek; Tim K. Maugel, Editor(s)