Rayleigh range

The Rayleigh range is a concept used in optics, particularly in the study of laser beams. It describes the distance over which a laser beam maintains its focus and intensity before it starts to spread out significantly. Essentially, it defines how far the laser can travel while still being effective at delivering a concentrated beam. This is important in applications such as telecommunications, cutting, or medical procedures where precise targeting is crucial. The Rayleigh range is influenced by factors like the beam's initial diameter and wavelength, determining its performance in different scenarios.