Swept source polarization-sensitive OCT with fiber-based polarization-diversity detection unit

Yutong Wu; Heping Li; Pinghe Wang; Hongzhou Dong; Zhongping Chen

doi:10.1117/12.2537287

20 November 2019 Swept source polarization-sensitive OCT with fiber-based polarization-diversity detection unit

Yutong Wu, Heping Li, Pinghe Wang, Hongzhou Dong, Zhongping Chen

Proceedings Volume 11190, Optics in Health Care and Biomedical Optics IX; 1119026 (2019) https://doi.org/10.1117/12.2537287
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Polarization-sensitive optical coherence tomography (PS-OCT) is an extension of OCT and provide the polarization information of biological tissues. Generally, the polarization-diversity detection of PS-OCT is free-space type, which is usually very complicated and reduces Signal to Noise Ratio (SNR). We built a polarization depth-encoding PS-OCT system with fiber-based polarization-diversity detection unit. The PS-OCT system was based on swept source OCT operating at 1310 nm, which has 100 kHz axial scan rates. The polarization depth-encoding was implemented by polarization-dependent spectral delay by combining of a polarization beam splitter (PBS) and two quarter-wavelength plates. The fiber-based polarization-diversity detection unit was implemented by the combination of fiber based polarization beam splitters and polarization controllers, which was used to calibrate the input light polarization of the fiberbased polarization beam splitters (FPBS). The acquired spectral signals were processed with standard Fourier domain OCT procedure including background subtraction, numerical dispersion compensation, zero padding and Fourier transforming. Jones Matrix Measurement method was adopted to process the Fourier transformed complex-valued OCT signals to compute the information of polarization properties of sample. And we measured zero-order, quarter-wave plate at 1310nm wavelength and zero-order, half-wave plate at 514nm wavelength to verify the accuracy of the system. We also obtained the image of human’s skin of fingertip. This PS-OCT system with fiber-based polarization-diversity detection unit can be obtained from standard swept source OCT easily, and can be further widely used in biomedical applications such as correlating burn depth and measuring the birefringence of the retinal nerve fiber layer.

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Yutong Wu, Heping Li, Pinghe Wang, Hongzhou Dong, and Zhongping Chen "Swept source polarization-sensitive OCT with fiber-based polarization-diversity detection unit", Proc. SPIE 11190, Optics in Health Care and Biomedical Optics IX, 1119026 (20 November 2019); https://doi.org/10.1117/12.2537287

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KEYWORDS

Optical coherence tomography

Polarization

Signal processing

Beam splitters

Signal to noise ratio

Tissues

Biomedical optics

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