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What is a LASER and how does it work?

What is a LASER, how does it work and What is its uses? First up - LASER is actually an acronym
LASER is short for Light Amplification by Stimulated Emission of Radiation

In 1917 +Albert Einstein  ( +Albert Einstein fan page    ) introduced the concept of stimulated
emission and laid down the foundation of the LASER.  The concept Einstein developed was that when a photon stimulates an excited molecule or atom a second photon with the same frequency, phase, polarization and direction is emitted.  For a detailed explanation, have a look at this +YouTube video:

The first operational LASER was developed by Theodore Maiman in 1959 - he was also awarded the first LASER patent in 1960.  Since then more than 55'000 LASER patents have been awarded in America, so the multitude of uses and applications for LASERS of today was certainly the work of a number of brilliant scientists and engineers.

For a full list of laser applications, have a look at this wiki: list of applications.  Since t…

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