For These Holograms, One Laser Is Better Than Two

Shhh. Don't tell Gregory J. Salamo that you're supposed to need two lasers to make holograms. That's because the so-called interference patterns produced at the intersection of two beams--one carrying an image, the other serving as a reference--are what make it possible to store three-dimensional images on film or in crystals. But a research team headed by Salamo, a physics professor at the University of Arkansas in Fayetteville, has discovered a way to record and retrieve holographic images with just one laser.

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