Optics: Pure Light for Practical Pictures

From repairing damaged retinas in the human eye to burning precision holes in industrial diamonds, the list of uses for laser light has grown steadily since the fierce, pure beams were first projected less than ten years ago. A recent application may yet prove to be one of the most practical of all. With lasers (for "light amplification by stimulated emission of radiation") to help them take their pictures, Professor George Stroke and his associates at the University of Michigan are perfecting the techniques of holography—three-dimensional photography without the use of a lens.

Holography produces no familiar photographic negative or print....

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