Spectral-domain low-coherence interferometry for phase-sensitive measurement of Faraday rotation at multiple depths

Yi Jou Yeh, Adam J. Black, Taner Akkin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We describe a method for differential phase measurement of Faraday rotation from multiple depth locations simultaneously. A polarization-maintaining fiber-based spectral-domain interferometer that utilizes a low-coherent light source and a single camera is developed. Light decorrelated by the orthogonal channels of the fiber is launched on a sample as two oppositely polarized circular states. These states reflect from sample surfaces and interfere with the corresponding states of the reference arm. A custom spectrometer, which is designed to simplify camera alignment, separates the orthogonal channels and records the interference-related oscillations on both spectra. Inverse Fourier transform of the spectral oscillations in k-space yields complex depth profiles, whose amplitudes and phase difference are related to reflectivity and Faraday rotation within the sample, respectively. Information along a full depth profile is produced at the camera speed without performing an axial scan for a multisurface sample. System sensitivity for the Faraday rotation measurement is 0.86 min of arc. Verdet constants of clear liquids and turbid media are measured at 687 nm.

Original languageEnglish (US)
Pages (from-to)7165-7170
Number of pages6
JournalApplied Optics
Volume52
Issue number29
DOIs
StatePublished - Oct 10 2013

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