What distinguishes the properties of laser light from ordinary light?

Laser light is distinct from ordinary light primarily due to its coherence and monochromaticity. Coherence refers to the property of light waves being in phase and having a predictable phase relationship over a certain distance, which allows laser light to maintain its stability and directionality. This is why lasers are able to produce a highly focused beam of light that can travel long distances without scattering.

Monochromaticity indicates that laser light consists of a single wavelength or color, which leads to its uniform color and energy. In contrast, ordinary light sources, such as incandescent bulbs or fluorescent lights, emit a broad spectrum of wavelengths, resulting in a mixture of colors.

These two properties—coherence and monochromaticity—enable lasers to be utilized in various applications, including medical procedures, communication technologies, and precision measurements, where controlled and consistent light is essential.