# Photon diffusion

## From Wikipedia, the free encyclopedia

**Photon diffusion** is a situation where photons travel through a material without being absorbed, but rather undergoing repeated scattering events which change the direction of their path. The path of any given photon is then effectively a random walk. A large ensemble of such photons can be said to exhibit diffusion in the material, and can be described with a diffusion equation.

This article needs additional citations for verification. (December 2009) |