David Kirkpatrick

March 2, 2010

Happy 50th birthday to the laser

Lasers are just cool, and now they have been for fifty years. Hit the link for photos and a thorough Technology Review history on controlling excited photons.

From the link:

This year is the 50th anniversary of the laser, a device used in applications from performing precise surgical procedures to measuring gravitational waves. In 1917, Albert Einstein proposed that a photon hitting an atom in a high energy state would cause the atom to release a second photon identical in frequency and direction to the first. In the 1950s, scientists searched for a way to achieve this stimulated emission and amplify it so that a group of excited atoms would release photons in a chain reaction. In 1959, American physicist Gordon Gould publicly used the term “light amplification by stimulated emission of radiation” for the first time. A year later, scientists demonstrated the first working optical laser.


Credit: HRL Laboratories

1 Comment »

  1. […] of California Berkeley — davidkirkpatrick @ 2:15 am This image is part of the series linked in the previous post on the laser turning 50, but it deserves highlighting as a very cool nanotechnology […]

    Pingback by Cool nanotech image — cadmium sulfide semiconducting laser « David Kirkpatrick — March 2, 2010 @ 2:15 am


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