What is the medium used in optical storage systems for reading and rec

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What is the medium used in optical storage systems for reading and recording data ?

High-energy visible light
Laser light
Ultraviolet light
Black light
This question was previously asked in
UPSC CISF-AC-EXE – 2021
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Optical storage systems, such as CDs, DVDs, and Blu-ray discs, use a focused beam of light to read and write data on the surface of the disc. This light is typically produced by a laser diode. The laser beam interacts with the data layer on the disc, and changes in the reflected light are detected and interpreted as data (pits and lands representing binary 0s and 1s). For writing, a higher power laser is used to physically alter the data layer.
– Optical storage relies on light to interact with the storage medium.
– Lasers provide the focused, coherent light required for the high data densities and precision needed in optical storage.
The wavelength of the laser light varies depending on the type of optical media. CDs use infrared laser (around 780 nm), DVDs use red laser (around 650 nm), and Blu-ray discs use blue-violet laser (around 405 nm). Shorter wavelengths allow for smaller pits/lands and thus higher storage capacity.

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