Brillouin Gain

Brillouin gain is a physical process where light traveling through a medium, such as an optical fiber, interacts with tiny vibrations or acoustic waves within that medium. When the conditions are right, the light transfers energy to these vibrations, amplifying a specific frequency of light in the process. This phenomenon is used in various applications like sensing and signal amplification, as it allows precise control and measurement of physical properties such as temperature and pressure by analyzing how the light's properties change due to the Brillouin gain effect.