Source: /cirosantilli/absorption-spontaneous-and-stimulated-emission

= Absorption, spontaneous and stimulated emission
{wiki}

Bibliography:
* https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electro-Optics/Direct_Energy_(Mitofsky)/07%3A_Lamps%2C_LEDs%2C_and_Lasers/7.01%3A_Absorption%2C_Spontaneous_Emission%2C_Stimulated_Emission