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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 29 — Oct. 10, 2013
  • pp: 7165–7170

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

Yi-Jou Yeh, Adam J. Black, and Taner Akkin  »View Author Affiliations

Applied Optics, Vol. 52, Issue 29, pp. 7165-7170 (2013)

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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.

© 2013 Optical Society of America

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(230.2240) Optical devices : Faraday effect
(260.2110) Physical optics : Electromagnetic optics

ToC Category:
Optical Devices

Original Manuscript: May 14, 2013
Revised Manuscript: September 18, 2013
Manuscript Accepted: September 19, 2013
Published: October 9, 2013

Yi-Jou Yeh, Adam J. Black, and Taner Akkin, "Spectral-domain low-coherence interferometry for phase-sensitive measurement of Faraday rotation at multiple depths," Appl. Opt. 52, 7165-7170 (2013)

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