title: Self-referenced method for optical path difference calibration in low-coherence interferometry.
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.
authors.affiliation: Institute of Biomedical Imaging, Optics and Engineering, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. markus.laubscher@epfl.ch
authors.forename: M
authors.initials: M
authors.lastname: Laubscher
authors.forename: L
authors.initials: L
authors.lastname: Froehly
authors.forename: B
authors.initials: B
authors.lastname: Karamata
authors.forename: R P
authors.initials: RP
authors.lastname: Salathé
authors.forename: T
authors.initials: T
authors.lastname: Lasser
mesh_terms: D002138:Calibration; D007368:Interferometry; D008962:Models, Theoretical; D012016:Reference Values; D013057:Spectrum Analysis