Spectrally pure lasers lie at the heart of precision high-end scientific and commercial applications, thanks to their ability to produce near-perfect single-color light. A laser's capacity to do so is measured in terms of its linewidth, or coherence, which is the ability to emit a constant frequency over a certain period of time before that frequency changes.
from Top Technology News -- ScienceDaily http://bit.ly/2DOmiQz
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Laser capable of emitting light quiet enough to move demanding scientific applications
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