Lasersäteilähteestä
Lasersäteilähteestä refers to the source of laser radiation. A laser, which is an acronym for Light Amplification by Stimulated Emission of Radiation, produces a highly focused, monochromatic, and coherent beam of light. The core of any laser is the gain medium, which can be a solid, liquid, or gas. This medium is energized by a pump source, such as an electrical current, another laser, or a flash lamp. When the atoms or molecules in the gain medium absorb energy, they become excited to a higher energy level.
As these excited particles return to their lower energy state, they emit photons. In a laser, this
Different types of gain media and pump sources result in different types of lasers, each with unique