Measurement of Thickness and Refractive Index of Optical Samples in FD-OCT with Two Orthogonal Polarized Lights
This chapter proposed an improved structure of frequency-domain optical coherence tomography (FD-OCT) which can measure the thickness and the refractive index of unknown sample simultaneously. In the conventional FD-OCT system, the mirror signal and autocorrelation terms will be generated after the inverse Fourier Transform and result in measurement range is restricted. Therefore, this study presents an improved method using the theory of phase-shifting algorithm with two orthogonal polarized lights to increase measurement range and eliminate unnecessary noise. By phase-shifting algorithms, eliminating unnecessary noise becomes possible and the measurement range is doubled. In other words, the structure of FD-OCT achieves simultaneous measurement of thickness and refractive index of optical samples based on full-range measurement.
KeywordsOptical coherence tomography (OCT) Optical imaging Orthogonal polarized lights
The current authors gratefully acknowledge the financial support provided to this study by the Ministry of Science and Technology, Taiwan under the grant MOST 103-2622-E-150-013-CC3.