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

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. (C) 2003 Optical Society of America.


Published in:
Optics Letters, 28, 24, 2476-2478
Year:
2003
ISSN:
0146-9592
Note:
Swiss Fed Inst Technol, Inst Biomed Imaging Opt & Engn, CH-1015 Lausanne, Switzerland. Laubscher, M, Swiss Fed Inst Technol, Inst Biomed Imaging Opt & Engn, CH-1015 Lausanne, Switzerland., ISI Document Delivery No.: 751PC, Times Cited: 1, Cited Reference Count: 5
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 Record created 2006-10-03, last modified 2018-03-18

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