非高斯分布光谱光源OCT系统的轴向分辨率计算  

Axial Resolution Calculation of OCT System Illuminated by a Non-Gaussian Spectrum Source

作　　者：岳献 杨亚良[1,2] 刘颖 代豪 肖飞[1,2] 耿超[1,2] Yue Xian;Yang Yaliang;Liu Ying;Dai Hao;Xiao Fei;Geng Chao(Key Laboratory of Adaptive Optics,Chinese Academy of Sciences,Chengdu,Sichuan 610209,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu,Sichuan 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院自适应光学重点实验室,四川成都610209 [2]中国科学院光电技术研究所,四川成都610209 [3]中国科学院大学,北京100049

出　　处：《光学学报》2021年第4期117-123,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61575205,61805248);国家重大科学仪器设备开发专项(2012YQ120080);中国科学院光电技术研究所前沿部署项目。

摘　　要：提出一种基于维纳-辛钦定理计算光学相干层析成像(OCT)系统轴向分辨率δ_(z)的通用方法:对光源的功率谱密度分布进行傅里叶逆变换,得到其自相干函数,由其半峰全宽值来获得δ_(z)。利用该方法计算了高斯和非高斯分布光谱光源OCT系统的δ_(z),通过与厂商给出的产品标称值相比较,验证了本方法对于高斯和非高斯分布光谱光源的正确性。以超宽带白光光源为例,使用滤光片滤除边缘部分光谱后形成非高斯分布光谱,搭建实验系统,实测δ_(z),所得结果与本方法的计算结果较为接近,实验验证了本方法的正确性。本方法对于非高斯分布光谱光源OCT系统δ_(z)的计算结果,能为系统设计时的参数考虑与器件选择等提供依据。In this paper,a general method for calculating the axial resolution(δ_(z))of optical coherence tomography(OCT)system based on the Wiener-Khinchin theorem was proposed.The power spectral density(PSD)distribution of a light source was subject to inverse Fourier transform to obtain the self-coherence function of the source,and the full width at half maximum of the function was employed to calculate theδ_(z).Theδ_(z) values of the OCT systems illuminated by the Gaussian and non-Gaussian spectrum sources were calculated by this method,respectively,and its validity for the above sources was verified by comparing the calculated values with the nominal values of products given by the manufacturers.Furthermore,an ultra-broadband white light source was taken as an example to form a non-Gaussian spectrum by edge filtering with two filters.An experimental setup was built to measure theδ_(z),and the result was very close to the calculated one with the proposed method.In conclusion,the method proposed in this paper can be applied to theδ_(z) calculation of OCT systems illuminated by non-Gaussian spectrum sources,providing a basis for the parameter consideration and component selection during system design.

关 键 词：成像系统 光学相干层析成像 非高斯分布光谱 轴向分辨率 光谱滤波 超宽带光源 

分 类 号：O436.1[机械工程—光学工程]