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Synthesized source for white-light sensing systems

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Abstract

We report a novel technique in which by combining the output from two multimode laser diodes a synthesized source with an extremely short coherence length is produced for use in white-light interferometric sensing systems. Experimentally and theoretically it is demonstrated that, by summing the autocorrelation function of two multimode laser diodes with a wavelength difference of 108 nm, a synthesized source with an equivalent coherence length of ~4 μm is generated, greatly reducing the signal-to-noise ratio required to identify the central fringe position.

© 1993 Optical Society of America

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