Source: cirosantilli/history-of-stimulated-emission

= History of stimulated emission

First postulated by <Einstein> in 1917 on his paper <Zur Quantentheorie der Strahlung>" ("<On the Quantum Theory of Radiation>") as a more elegant way to rederive <Planck's law> as part of the <Einstein coefficients> framework.

At that time there was no other physical evidence supporting the existence of the concept except that it looked more elegant.

Bibliography:
* <The History of the Laser by Mario Bertolotti>

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