Laser Cooling

By Anupum Pant

The navy is using laser to burn stuff and destroy stuff. They have laser guns to fry enemies in almost every sci-fi movie. But did you know that a laser can be used to cool stuff to the temperatures much much lower than anything else can cool them to. Where refrigerators, liquid nitrogen or liquid helium do not work, laser cooling does. And this is how scientists have been able to achieve temperatures to within a millionth of a degree of absolute zero (–273.15°C or –459.67°F). That’s the closest to the lowest temperature we can get to, theoretically.

This is how it is done.

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