Which property of laser light contributes to its monochromatic nature?

The property of laser light that contributes to its monochromatic nature is its narrow wavelength distribution. Monochromatic light refers to light that consists of a single wavelength or color. In contrast to ordinary light sources, which emit a wide range of wavelengths, lasers are engineered to emit light that is very close to a single wavelength due to the stimulated emission process. This results in a very narrow bandwidth, often just a few nanometers wide, which is what gives laser light its characteristic color, allowing it to be perceived as one specific color rather than a blend of colors.

The narrow wavelength distribution ensures that the light emitted is coherent, meaning the waves are in phase with each other, and this coherence is fundamental for applications such as holography and laser cutting, where precision is critical.

The other options, while related to light properties, do not support the monochromatic aspect of laser light. A diverse frequency range implies a spread of wavelengths, high intensity does not define color, and an irregular phase relationship disrupts coherence rather than supporting it. Thus, the defining characteristic of laser light being monochromatic is accurately aligned with its narrow wavelength distribution.