Definition of optical disc

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PowerPhotonic Ltd. - Bessel Beam Generator LB 6/24

Photonics Dictionary

optical disc: A rigid medium, generally a polycarbonate substrate coated with a reflective aluminum layer, that stores information (such as audio, video or data) as digital bits in the form of variations in the reflective surface, and that modulates a laser beam to decode the stored data. Optical disc formats include read-only (ROM) and write-once/read-many (WORM); erasable discs include phase-change, magneto-optical and dye-polymer media.

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