Optical coherence tomography method and optical coherence tomography system for complex polarization frequency domain

Abstract

The invention discloses an optical coherence tomography method and an optical coherence tomography system for a complex polarization frequency domain. The method comprises the following steps of: on the basis of optical coherence tomography of a polarization frequency domain, driving a reference plane mirror of a reference arm to vibrate by a phase modulation device, introducing sinusoidal phase modulation while transversely scanning a sample, performing processing such as Fourier transform on acquired interference signals of horizontal and vertical polarization channels to obtain chromatography signals of the horizontal and vertical polarization channels without parasitic images, extracting magnitudes and phases of the chromatography signals respectively, and calculating to obtain an intensity image, a fast axis image and a delay image of the sample with double refraction properties within a full-depth range. According to the method, the imaging speed is high, a complex conjugate mirror image, a direct-current background and the self-coherence noise in the coherent tomography of the polarization frequency domain are removed, the sensitivity cannot be reduced along with the prolonging of a transverse scanning distance, and the method is not sensitive to motion blur in the sample.

Description

technical field [0001] The present invention relates to frequency-domain optical coherence tomography (Fourier-Domain Optical Coherence Tomography, referred to as FD-OCT), in particular to a polarization complex frequency-domain optical coherence tomography method and system. Background technique [0002] Optical Coherence Tomography (OCT) is a biomedical tomography technology based on low-coherence light interference. It has high resolution and non-invasiveness, and can perform non-destructive detection of biological tissues within a few millimeters in depth. . After Huang et al. proposed this concept in 1991 (see prior art [1], D.Huang, E.A.Swanson, C.P.Lin, J.S.Shuman, W.G.Stinson, W.Chang, M.R.Hee, T.Flotte, K.Gregory, C.A.Puliafito and J.G.Fujimoto, "Optical coherence tomography", Science, Vol.254, pp.1178-1181, 1991), OCT is widely used in the diagnosis and research of ophthalmology, skin, cardiovascular and other fields. [0003] Frequency-domain optical coherence t...

AI Technical Summary

Problems solved by technology

This method uses electro-optic modulation devices to generate left and right circularly polarized light to image samples with birefringence properties. The system is expensive and the trigger signals of CCD and electro-optic modulation devices need to be strictly controlled.

At the same time, due to the use of linear phase modulation, as the horizontal scanning range increases, the image sensitivity decreases

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