What is one characteristic of laser active mediums?

The characteristic of laser active mediums is that they can exist in gas, solid, and liquid forms. This versatility is crucial because the type of active medium influences the wavelength of the laser light produced, as well as the efficiency and application of the laser.

For instance, solid-state lasers use crystals or glass as an active medium, gas lasers utilize gases like helium-neon or carbon dioxide, and liquid lasers use dye solutions. Each of these mediums has unique properties that make them suitable for specific applications, such as surgical procedures, industrial cutting, or scientific research. Understanding the diversity of active mediums enhances the ability to choose the right laser for specific purposes, making this characteristic essential in laser technology.