laser History
Foundations
In 1917, Albert Einstein established the theoretic foundations for the laser and the
maser in the paper Zur Quantentheorie der Strahlung (On the Quantum Theory of
Radiation); via a re-derivation of Max Planck’s law of radiation,...
More
laser History
Foundations
In 1917, Albert Einstein established the theoretic foundations for the laser and the
maser in the paper Zur Quantentheorie der Strahlung (On the Quantum Theory of
Radiation); via a re-derivation of Max Planck’s law of radiation, conceptually based
upon probability coefficients (Einstein coefficients) for the absorption, spontaneous
emission, and stimulated emission of electromagnetic radiation; in 1928, Rudolf W.
Ladenburg confirmed the existences of the phenomena of stimulated emission and
negative absorption;[8] in 1939, Valentin A.
Fabrikant predicted the use of stimulated
emission to amplify “short” waves;[9] in 1947, Willis E.
Lamb and R.
C.
Retherford
found apparent stimulated emission in hydrogen spectra and effected the first
demonstration of stimulated emission;[8] in 1950, Alfred Kastler (Nobel Prize for
Physics 1966) proposed the method of optical pumping, experimentally confirmed,
two years later, by Brossel, Kastler, and Winter.
Maser
In 195
Less