Topics in this Issue
Images of atmospheric ice crystals, reconstructed from digital holograms. The holograms were obtained at the High Altitude Research Station "Jungfraujoch," located 3.5km a.s.l. in the Swiss Alps. Reconstructions based on the hologram intensity alone are troubled by a spurious "twin image" (left). Recovering the hologram's phase distribution using the cascaded adaptive mask phase retrieval algorithm allows for twin image removal (right), in some cases revealing otherwise unobservable structural details (top right). The lower images show a bundle (rosette) of ice columns with dendritic endplates. The holograms are recorded as 8 bit grayscale images using laser light at 532 nm. Here, the reconstructions are shown in false color and the top images are inverted for better display. For details see the paper by Raupach, pp. 287-301.
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