4 May 2012 Spectroscopic identification of materials with calibrated full-field optical coherence tomography in the visible range
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Abstract
For twenty years Optical Coherence Tomography (OCT) has been interested in imaging in turbid media. Recently, conventional OCT has been extended to spectroscopic investigation (SOCT). For a full-field OCT configuration in the visible range, we show that the interference conditions are not equal in the whole field of view: the effective numerical aperture depends on the observation point. This results in a spectral shift towards higher wavelengths of the OCT spectra, leading to errors in spectroscopic analysis. We propose a general calibration method for SOCT measurements which has been tested within a protocol, to perform spatially-resolved spectroscopic identification of material by OCT. Firstly we measure the reflectivity of a plane gold sample, corresponding closely to the measurement made with a spectrometer. Then we successfully identify the reflectivity of gold in a mixed sample (silicon and gold).
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Antoine Morin, Jean-Marc Frigerio, "Spectroscopic identification of materials with calibrated full-field optical coherence tomography in the visible range", Proc. SPIE 8430, Optical Micro- and Nanometrology IV, 84300L (4 May 2012); doi: 10.1117/12.921539; https://doi.org/10.1117/12.921539
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