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
J. Surville, L. Videau, S. Montant, C. Stenz, and C. Sauteret, "Spatial and temporal coherence characterization of a smoothed laser beam," Opt. Lett. 29, 2336-2338 (2004)