Lasers are described as being monochromatic, which means they are:

Monochromatic refers to light consisting of a single wavelength. This property is fundamental to laser functionality, as it ensures that the light produced by a laser is highly coherent and of a specific color. The monochromatic nature of lasers leads to various applications, such as in medical devices, communications, and precision cutting, where a narrow wavelength is necessary for effective results.

When light is monochromatic, it allows for minimal dispersion and interference, leading to sharper focuses and more precise interactions with materials and biological tissues. This is in contrast to polychromatic light, which consists of multiple wavelengths and leads to broader spectral output not suitable for applications requiring high precision or specific interactions. Understanding this fundamental property is critical for utilizing lasers effectively in various fields.