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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 28, Iss. 24 — Dec. 15, 2003
  • pp: 2476–2478

Self-referenced method for optical path difference calibration in low-coherence interferometry

M. Laubscher, L. Froehly, B. Karamata, R. P. Salathé, and T. Lasser  »View Author Affiliations


Optics Letters, Vol. 28, Issue 24, pp. 2476-2478 (2003)
http://dx.doi.org/10.1364/OL.28.002476


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Abstract

A simple method for the calibration of optical path difference modulation in low-coherence interferometry is presented. Spectrally filtering a part of the detected interference signal results in a high-coherence signal that encodes the scan imperfections and permits their correction. The method is self-referenced in the sense that no secondary high-coherence light source is necessary. Using a spectrometer setup for spectral filtering allows for flexibility in both the choice of calibration wavelength and the maximum scan range. To demonstrate the method’s usefulness, it is combined with a recently published digital spectral shaping technique to measure the thickness of a pellicle beam splitter with a white-light source.

© 2003 Optical Society of America

OCIS Codes
(110.1650) Imaging systems : Coherence imaging
(110.4500) Imaging systems : Optical coherence tomography
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5800) Instrumentation, measurement, and metrology : Scanners
(170.4500) Medical optics and biotechnology : Optical coherence tomography

Citation
M. Laubscher, L. Froehly, B. Karamata, R. P. Salathé, and T. Lasser, "Self-referenced method for optical path difference calibration in low-coherence interferometry," Opt. Lett. 28, 2476-2478 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-24-2476

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