In laser terminology, what does the term 'locked in phase' mean?

The term 'locked in phase' refers to the relationship between the wavelengths and oscillations of the light waves emitted by a laser. When light is said to be 'locked in phase,' it means that the light maintains a consistent frequency and coherent oscillation, meaning that all the light waves reinforce each other at specific points in time and space.

This coherence is a critical characteristic of laser light, allowing for the tight beam and high intensity that distinguishes lasers from other light sources. When the waves are in phase, they create a stable and predictable output, necessary for various applications in technology and medicine. This consistency in frequency is what enables lasers to produce clear and focused beams instead of scattering or diffusing like ordinary light sources.