From Theory to the First Working Laser Laser History—Part I
I feature_ laser history From theory to the first working laser Laser history—Part I Author_Ingmar Ingenegeren, Germany _The principle of both maser (microwave am- 19 US patents) using a ruby laser. Both were nom- plification by stimulated emission of radiation) inated for the Nobel Prize. Gábor received the 1971 and laser (light amplification by stimulated emis- Nobel Prize in Physics for the invention and devel- sion of radiation) were first described in 1917 by opment of the holographic method. To a friend he Albert Einstein (Fig.1) in “Zur Quantentheorie der wrote that he was ashamed to get this prize for Strahlung”, as the so called ‘stimulated emission’, such a simple invention. He was the owner of more based on Niels Bohr’s quantum theory, postulated than a hundred patents. in 1913, which explains the actions of electrons in- side atoms. Einstein (born in Germany, 14 March In 1954 at the Columbia University in New York, 1879–18 April 1955) received the Nobel Prize for Charles Townes (born in the USA, 28 July 1915–to- physics in 1921, and Bohr (born in Denmark, 7 Oc- day, Fig. 2) and Arthur Schawlow (born in the USA, tober 1885–18 November 1962) in 1922. 5 Mai 1921–28 April 1999, Fig. 3) invented the maser, using ammonia gas and microwaves which In 1947 Dennis Gábor (born in Hungarian, 5 led to the granting of a patent on March 24, 1959. June 1900–8 February 1972) developed the theory The maser was used to amplify radio signals and as of holography, which requires laser light for its re- an ultra sensitive detector for space research.
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