What is a key feature of coherence in laser light?

A key feature of coherence in laser light is that the peaks and valleys of the waves travel in unison. This means that the light waves are in a consistent phase relationship with one another, which allows them to maintain a uniform frequency and a sharp wavelength. As a result, laser light is highly directional and can travel long distances without significant divergence, making it ideal for applications that require precision and concentration of energy, such as in surgical procedures or communication technologies.

Coherence contrasts sharply with random light sources, where the waves do not align in phase, resulting in broader spectral output and less focused energy. The properties of coherence also contribute significantly to the applications of lasers in various fields including medicine, manufacturing, and telecommunications. In summary, the organized and synchronized wave pattern is what defines the uniqueness and effectiveness of laser light compared to other light sources.