Feynman uses Dirac's notation to describe the quantum mechanics of stimulated emission... he applies that physics to... dye molecules... In this regard, Feynman could have predicted the existence of the tunable laser.
--
in Introduction to Lasers, F. J. Duarte (2003). Tunable Laser Optics. Elsevier Academic. p. 3. ISBN 0122226968. (while discussing The Feynman Lectures on Physics).Richard Feynman
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Feynman, Richard
Fforde, Jasper
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