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Full range polarization-sensitive Fourier domain optical coherence tomography

Jun Zhang, Woonggyu Jung, J. Stuart Nelson, and Zhongping Chen

Open Access Open Access

Abstract

A swept source based polarization-sensitive Fourier domain optical coherence tomography (FDOCT) system was developed that can acquire the Stokes vectors, polarization diversity intensity and birefringence images in biological tissue by reconstruction of both the amplitude and phase terms of the interference signal. The Stokes vectors of the reflected and backscattered light from the sample were determined by processing the analytical complex fringe signals from two perpendicular polarization-detection channels. Conventional time domain OCT (TDOCT) and spectrometer based FDOCT systems are limited by the fact that the input polarization states are wavelength dependent. The swept source based FDOCT system overcomes this limitation and allows accurate setting of the input polarization states. From the Stokes vectors for two different input polarization states, the polarization diversity intensity and birefringence images were obtained.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Schematic of the FDOCT system. Pol. Mod.: polarization modulator; Phase Mod.: phase modulator; Colli.: collimator; Atte.: adjustable neutral density attenuator; FFP: 100 GHz fiber Fabry-Perot interferometer; PC: polarization controller; PBS: polarization beam splitter; D1, D2, D3: photodetectors.

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Fig. 2.
Fig. 2. Synchronizing time clock diagram for the FDOCT system. Channel 1 is the sinusoidal signal to drive the swept source. Channel 2 is the signal used to trigger data acquisition. Channel 3 is the drive signal to control the polarization modulator.

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Fig. 3.
Fig. 3. Measured phase retardation versus actual phase retardation for different wave plates. The round-trip retardation values of the wave plates for measurement are 55.5°, 77°, 90°, 101.6° and 151.9°, respectively. The solid line represents the actual phase retardation and the points represent the measured phase retardation.

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Fig. 4.
Fig. 4. Images of the Stokes vectors, polarization diversity intensity and phase retardation in rabbit tendon. (a): Stokes vector images corresponding to the two input polarization states; (b): polarization diversity intensity image; and (c): phase retardation image.

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Equations (5)

Equations on this page are rendered with MathJax. Learn more.

H ( v ) = { 0 v < 0 1 v ≥ 0
I ( z ) = S ˜ H ( z ) S ˜ H * ( z ) + S ˜ V ( z ) S ˜ V * ( z )
Q ( z ) = S ˜ H ( z ) S ˜ H * ( z ) + S ˜ V ( z ) S ˜ V * ( z )
U ( z ) = 2 Re [ S ˜ H * ( z ) S ˜ V ( z ) ]
V ( z ) = 2 Im [ S ˜ H * ( z ) S ˜ V ( z ) ]
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