29 August 2006 Optical coherence tomography with phase-sensitive light
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A new configuration for optical coherence tomography is proposed that utilizes a phase-conjugate amplifier in conjunction with a Michelson interferometer to detect interference between two classical light fields with a non-zero phase-sensitive cross correlation. This imaging configuration - which we call phase-conjugate optical coherence tomography (PC-OCT) - shares the same factor-of-two axial resolution improvement and cancellation of even-order dispersion terms that are the key features of quantum optical coherence tomography, but without the necessity for non-classical signal and reference beams. Under appropriate conditions, PC-OCT can achieve a signal-to-noise ratio that is comparable to that of conventional optical coherence tomography.
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Baris I. Erkmen, Baris I. Erkmen, Jeffrey H. Shapiro, Jeffrey H. Shapiro, } "Optical coherence tomography with phase-sensitive light", Proc. SPIE 6305, Quantum Communications and Quantum Imaging IV, 630510 (29 August 2006); doi: 10.1117/12.679565; https://doi.org/10.1117/12.679565

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