What does the term 'coherent' indicate about laser waves?

The term 'coherent' in the context of laser waves indicates that these waves are synchronized in both space and time. Coherence refers to the correlation between the phases of the waves, meaning that the peaks and troughs of the waveforms align in a predictable manner. This synchronization allows laser light to maintain a consistent direction and wavelength, which is a key characteristic that differentiates it from other light sources.

Coherent waves are essential for laser functionality because they contribute to the laser's ability to concentrate energy over long distances, resulting in a highly focused and intense beam. Understanding this coherence is important in various applications of lasers, including medical, industrial, and scientific fields, where precise and powerful light delivery is required.