Abstract
We review the status of digital in-line holography with numericalreconstruction. Its application in optics with a laser as a sourceof coherent radiation has been perfected in recent years withoptimal resolution achievable on a routine basis in such diverseareas as three-dimensional mapping and tracking of micron-sizedparticle distributions, growth of polymer spherulite, and structuralstudies of cells and micro-organisms. Digital in-line holographywith coherent low-energy electron beams from an atomic-sized fieldemitter tip has now achieved nanoscale resolution and can, accordingto theoretical simulations and estimates, achieve atomic resolution, one hopes in the near future.
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