Depth extension and sidelobe suppression in optical coherence tomography using pupil filters

Xiaojun Yu, Xinyu Liu, Jun Gu, Dongyao Cui, Junying Wu, Linbo Liu

科研成果: 期刊稿件文章同行评审

25 引用 (Scopus)

摘要

We demonstrate a new focus engineering scheme to achieve both extended depth of focus (DOF) and sidelobe suppression in spectral-domain optical coherence tomography (SD-OCT) system. Each of the illumination pupil function and the detection pupil function is modulated using an annular pupil filter implemented by center obscuration. The two pupil filters are arranged in a dark-field configuration such that the first sidelobe of the illumination point-spread function (PSF) matches the first minimum of the detection PSF in the lateral focal plane. We tested the feasibility of the proposed scheme numerically, and then constructed a dark-field OCT (DFOCT) system to further verify its effectiveness experimentally. Simulation results show that a DOF gain of 4.2 can be achieved compared with a full aperture OCT (FA-OCT) system, with a suppression ratio of 2.9 dB for the first sidelobe compared with an annular-aperture bright-field OCT (BFOCT) system. Experimental results show that the constructed DF-OCT extends the DOF by three-fold compared with the constructed FA-OCT, and suppresses the first sidelobe by 3.1 dB compared with the BF-OCT. The penalty for the extended DOF is an ∼11.6 dB drop in sensitivity compared with the FA-OCT system.

源语言英语
页(从-至)26956-26966
页数11
期刊Optics Express
22
22
DOI
出版状态已出版 - 2014
已对外发布

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