28 February 2008 Polarization-sensitive swept-source optical coherence tomography with continuous polarization modulation
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We present fiber-based polarization-sensitive swept-source optical coherence tomography (PS-SS-OCT) with continuous polarization modulation. The light source is a high-speed wavelength sweeping source with 1.3 um center wavelength and 20 kHz sweeping frequency. A resonant electro-optic modulator modulates the incident polarization at 100/3 MHz, one-third of the data acquisition frequency. The modulated light is coupled into a single mode fiber coupler. A linear polarizer in the reference arm makes the intensity and state of polarization of the reference light be constant. In the sample arm, the polarization-modulated beam illuminates a sample. The reference beam and back reflected light from the sample are interfered and detected by two balanced photoreceivers at 100 M samples/s for horizontally and vertically polarized components. The polarization modulation generates the 0th and 1st order signals with respect to the modulation frequency. By extracting them individually, this system can measure Jones matrices of the sample with a single A-scan. Previous fiber-based PS-OCT systems with 2 or more states of the incident polarization required a high dense transversal scan in order to keep the correlation between adjacent A-scans. However, this method does not require a high dense transversal scan, thus long transversal imaging range is possible. We show the details of the method and measurement results of a quarter waveplate and biological samples.
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Masahiro Yamanari, Masahiro Yamanari, Shuichi Makita, Shuichi Makita, Toyohiko Yatagai, Toyohiko Yatagai, Yoshiaki Yasuno, Yoshiaki Yasuno, } "Polarization-sensitive swept-source optical coherence tomography with continuous polarization modulation", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 68471J (28 February 2008); doi: 10.1117/12.765285; https://doi.org/10.1117/12.765285

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