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There's a laser right in front of you - though you can't see it - in your computer's CD or DVD drive! When writing it etches tiny pits in the surface of the disc. When reading the disc it forms a photo-electric couple in which its beam is broken by the pits (each pit is a 1 or 0 - I don't know which).
They have numerous otherapplications such as:
Fine-cutting shapes from sheet-metal and other materials.
As the light source in fibre-optical electronics including the under-sea cables linking our respective telephone networks & hence our computers.
Certain surgical operations including on the eye.
Surveying equipment.
Bar-code scanners.
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