Coherent light theory

Coherent light refers to light waves that are in phase, meaning their peaks and troughs align consistently over time and space. This synchronization allows the waves to maintain a fixed relationship, resulting in a uniform, stable beam. Lasers produce coherent light, which is why laser beams are narrow and precise. In contrast, ordinary light sources like bulbs emit incoherent light, where waves are randomly phased, causing the light to spread out and scatter. Coherent light’s properties enable applications like holography, high-precision measurements, and optical communications, where stability and focus are essential.