Measurement of Thickness and Refractive Index of Optical Samples Simultaneously Using Full-Range One-Shot Frequency-Domain Optical Coherence Tomography

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This article proposes an improved frequency-domain optical coherence tomography for simultaneously measuring the thickness and refractive index of an unknown sample. In conventional frequency-domain optical coherence tomography systems, the spectrum of interference signals generates mirror signals and autocorrelation terms that result in a restricted measurement range. This study presents an improved method that involves applying a phase-shifting algorithm to orthogonally polarized light beams to increase the measurement range and eliminate unnecessary noise. However, a disadvantage is that the proposed method is suitable for the imaging of no (or very low) birefringent samples and needs to align properly the light’s states of polarization.