Einstein A+B coefficients (1917)

Layer 1 — Physicsin the laser-physics subtree

Einstein 1917: A21 spontaneous + B12/B21 stimulated absorption/emission rates; thermal-equilibrium ratio A21/B21 = 8 pi h nu^3 / c^3; foundation of laser theory.

Related concepts

Linear ODE
Quantum electrodynamics (QED)

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