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How do you focus regular light to make it a laser beam?

How do lasers work? Who invented the laser?

What Is A Laser Collimator?

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laser - Kids, Britannica Kids

What exactly is a laser beam?

Differences between ordinary light and laser beams

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Laser Beam Brain Stimulation Could Boost Short-Term Memory by 25

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Doughnut-shaped laser used to create an optical fibre out of air