Physics
Photon Emission and Stimulated Emission
Quick fact
Stimulated emission was first predicted by Einstein in 1917 and later became the foundation for modern laser technology.
Why this is interesting
Did you know that the same light you see from a laser is created by an incredibly precise process involving just a single particle of light? How does it get amplified?
Read the full explanation
Understanding Photon Emission and Stimulated Emission
Photon emission occurs when an atom releases energy as a photon. Stimulated emission is a special case where this process is triggered by another incoming photon, causing more photons to be emitted in phase with it.
A deeper explanation
In stimulated emission, an excited atom interacts with an incoming photon of the same frequency. This interaction causes the atom to drop to a lower energy level and emit a second photon that matches the first in direction, phase, and frequency. This process is crucial for creating coherent light—light that behaves as a single wave—and is the basis for how lasers produce their intense, focused beams.