Many imaging applications require increasingly bright illumination sources, motivating the replacement of conventional thermal light sources with bright light-emitting diodes, superluminescent diodes and lasers. Despite their brightness, lasers and superluminescent diodes are poorly suited for full-field imaging applications because their high spatial coherence leads to coherent artefacts such as speckle that corrupt image formation1,2. We recently demonstrated that random lasers can be engineered to provide low spatial coherence3. Here, we exploit the low spatial coherence of specifically designed random lasers to demonstrate speckle-free full-field imaging in the setting of intense optical scattering. We quantitatively show that images generated with random laser illumination exhibit superior quality than images generated with spatially coherent illumination. By providing intense laser illumination without the drawback of coherent artefacts, random lasers are well suited for a host of full-field imaging applications from full-field microscopy4 to digital light projector systems5.
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H.C. acknowledges support from the National Science Foundation (grants ECCS-1128542 and ECCS-1068642). M.A.C. acknowledges support through a K12 award from the Yale Child Health Research Center (5K12-HD001401-12). The authors wish to thank A.D. Stone, E.R. Dufresne, L.H. Staib and H.D. Tagare for discussions and H. Noh for technical assistance.
The authors declare no competing financial interests.
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Redding, B., Choma, M. & Cao, H. Speckle-free laser imaging using random laser illumination. Nature Photon 6, 355–359 (2012). https://doi.org/10.1038/nphoton.2012.90
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