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Source spectrum shaping method for low-coherence interferometry

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Abstract

Low-coherence interferometry (LCI) suffers mainly from low signal-to-noise (S/N) ratio. By using the source spectrum shaping method (SSSM), the authors can enhance the visibility of the zero-order fringe (V) and S/N ratio in LCI. The presented approach was analyzed numerically for a set of theoretical Gaussian light sources, with different central wavelengths and different spectrum widths. The results have shown a significant improvement of the visibility V. Additionally, a set of commercially available light emitting diodes was analyzed to find the best possible setup. Results of numerical calculations were verified experimentally in an SSSM low coherence Twyman–Green interferometric setup equipped with three light sources.

© 2015 Optical Society of America

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