1. Random laser produces speckle-free images

    Random laser produces speckle-free images

    Random lasers may have a future in imaging. A team at Yale University (New Haven, CT) who last year made random lasers with low spatial coherence has now used those low-coherence lasers for speckle-free imaging. The demonstration could open the door to new laser applications in biological imaging, picoprojectors, and cinema projectors. A byproduct of coherence, laser speckle is a shifting pattern of bright and dark zones produced when a laser beam passes through a scattering medium. It’s tolerable in many laser applications, but speckle degrades images recorded in laser light or displayed by laser projectors. “Speckle is a ...

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