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Spatial and temporal coherence characterization of a smoothed laser beam

J. Surville, L. Videau, S. Montant, C. Stenz, and C. Sauteret

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Abstract

The measurement of the coherence characteristics of the speckles generated by an optically smoothed laser source is investigated. We present a new method that can be used for every kind of smoothing technique. A modified Mach–Zehnder interferometer allows us to measure both the lifetime and the spatial transverse size of the hot spots generated by a broadband and transverse multimode source. Experimental results agree well with theoretical predictions.

© 2004 Optical Society of America

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