Enhancement of depth resolution in optical coherence tomography by apodization

摘要

In this paper we introduce a method to increase the axial resolution in optical coherence tomography (OCT) by combining coherence gating with apodization through an appropriate pupil filter. In the proposed probe of our OCT system, the width of the central lobe of the axial point spread function is apodized to be within the coherence length of the light source, while its side-lobes are lying outside without contributing to coherence imaging. It comes to a conclusion that we can obtain unproved resolution in OCT system without recurring to broadening the bandwidth of light source, which is nevertheless costing and inconvenient in implementation.