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

M Laubscher; L Froehly; B Karamata; R P Salathé; T Lasser

doi:10.1364/ol.28.002476

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

M Laubscher·L Froehly·B Karamata·R P Salathé·T Lasser

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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.

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M Laubscher, L Froehly, B Karamata, R P Salathé, T Lasser. 2003-12-15. Self-referenced method for optical path difference calibration in low-coherence interferometry.. https://doi.org/10.1364/ol.28.002476

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