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and information processing.

An early instance of the word was in a December 1954 letter from John W. Campbell to Gotthard Gunther:

Incidentally, I've decided to invent a new science -- photonics. It bears the same relationship to Optics that electronics does to electrical engineering. Photonics, like electronics, will deal with the individual units; optics and EE deal with the group-phenomena! And note that you can do things with electronics that are impossible in electrical engineering!

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