The wavelength of the laser actually varies based on the technology used, with CDs using an infrared 780nm wavelength, DVDs using a red 650nm, and Blu-Ray reducing this further to 405nm, which explains why these discs are not cross compatible. This process, known as the optical path, usually consists of a semiconductor laser diode to provide a light source, a lens to focus that light onto a particular spot on the disc, and a photodiode that picks up the reflected light. The optical drive reads information from a disc by shooting a laser onto the surface and detecting the resultant reflections, which will vary based on the deviations on the surface of the disc. Optical drives are commonly found in desktop computers, game consoles, and CD/DVD/Blu-Ray players, as these devices all require the physical media of a laser disc to operate, although the adoption of internet updates has made this less true for computers in recent years. Optical drives are devices which can read and/or write data from optical discs using lasers or electromagnetic waves near the visible spectrum of light.
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