June 2024
Beginner
259 pages
8h 32m
English
This chapter has been made available under a CC-BY-NC-ND 4.0 license.
The word “laser” comes from “light amplification by stimulated emission of radiation.” In 1916, Albert Einstein discovered that a single photon of light passing through a substance could stimulate the emission of further photons. Specifically, the electron in the atom absorbs energy and jumps from the low energy level to the high energy level. Then when it goes back from the high energy level to the low energy level, the energy is released in the form of photons.
When mentioning lasers, many people think of laser weapons, laser cutting, laser welding, laser surgery, etc. It seems that laser ...
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