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That means the beam produced is of higher quality than other lasers, is extremely straight (even by the exacting standards of a normal laser beam) and can thus be focused onto a small area.
ECONOMIST: Solar power from space
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In this, the stream of video and audio data is recorded as a series of minuscule spots on the disc's surface that have been gently fried by a laser beam and turned from their normal crystalline condition to an amorphous state that has different reflective properties.
ECONOMIST: Digital video discs
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From a standing start, the reconstructed beam sped back up to the normal speed of light.
BBC: NEWS | Science/Nature | Cool clouds turn light to matter