How far is the Moon from Earth? How much does a liter of milk? Or, what is written on the CD case that you are not in your hands? There is only one way to answer all the questions to have a laser . It is shooting a laser beam towards a reflector placed by the astronauts on the moon that we know the distance that separates us from our satellite (384mila km). Thus, it is past the reader of the case the bar code printed on the carton of milk, or any other product in the supermarket, we know how much to pay. And also to listen to a CD, we need an optical drive. All applications of the same brilliant idea, that of ' light amplification by stimulated emission of radiation . In a word of the laser , invented by Gordon Gould (1920-2005) on the night of November 9, 1957 .
Have you ever seen the light photographed? Here are the pictures.
Gould, a physicist with a doctorate in New York spectroscopy at Columbia University , it had risen shortly after midnight, a prey to the urge to write what had been flashed in my head. He put it down on paper his notes ( "Some rough calculations on the feasibility of a laser: Light Amplification by Stimulated Emission of Radiation" ), on the feasibility of the laser . It was the first time that acronym was used. He was to indicate the way the light was amplified to produce a beam narrow and high-power, and Gordon was well aware of the extent of his insight. So much so that when he had finished writing his notes brought because they were authenticated by a notary. Almost imagined how much profit would be returned over time....
thivest.com
No comments:
Post a Comment