Articles on Laser

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Lasers create colorful light shows at concerts, are used by doctors in surgeries – and are used in scientific laboratories. EyeWolf/Getty Images

What is the slowest thing on Earth?

Physicists can use bright, hot lasers to slow atoms down so much that they measure -459 degrees Fahrenheit.
Mating laser-driven atomic clocks like the one shown here with microwaves promises more accurate electronic devices. N. Phillips/NIST

Pairing lasers with microwaves makes mind-bogglingly accurate electronic clocks – a potential boon for GPS, cell phones and radar

Researchers have made some of the most accurate clocks imaginable in recent years, but the trick is harnessing those clocks to electronics. Using lasers to tune microwaves bridges the gap.
The crests (bright) and troughs (dark) of waves spread out after they were produced. The picture applies to both light and sound waves. Titima Ongkantong

A new type of laser uses sound waves to help to detect weak forces

Most people are familiar with lasers. But what about a laser made with sound rather than light? A couple of physicists have now created one that they plan to use for measuring imperceivable forces.

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