photonics
n. Products and technologies that operate using light energy (i.e., photons; cf. electronics).

Example Citation:
"Thermo Vision Corp....designs, manufactures, and markets a diverse array of photonics products, including optical components, imaging sensors and systems, lasers, and fiber optics."
—Jerry Ackerman, "Traditional industries dominate IPOs as more tech firms become takeover bait," The Boston Globe

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