Figure 2b shows a high-resolution grayscale image with 1300 × 1300 pixels, which is to be hidden in the optical beam. The resultant beam has a dimension of 390 × 390 μm because each pixel has a ...

From a chaotic day at the waterhole to starry night skies, the winners of the Nature TTL Photographer of the Year competition celebrate the wonder—and ruthlessness—of nature.