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LASER: Light Amplification by Stimulated Emission of Radiation

Shira Yehudit Djalilmand

Laser is claimed to be one of the 20th century’s greatest inventions. What is laser, and what is it used for?

Tuesday, November 20, 2012

laser beams What is Laser?

Laser should actually be written “LASER,” as it’s an acronym for Light Amplification by Stimulated Emission of Radiation. Laser is an optical amplifier, which means that it strengthens light waves. In practical terms, this means that lasers can produce all kinds of light beams — a continuous light or an on/off pulse beam. There are different strengths of lasers, from the tiniest of the tiny to the most powerful, which uses 1,200 times the entire electrical capacity of the US — but for only a microsecond. Lasers also come in different sizes, ranging from smaller than the diameter of a human hair to bigger than a football stadium. 

 

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