Laser systems
Definition
Basic concept of laser systems
A laser system is an integrated set of elements and devices intended to generate, control and apply a coherent, monochromatic, high-intensity beam of light known as a laser. This system allows the emission of amplified light by stimulated emission of radiation, a characteristic that distinguishes lasers from other light sources. Laser systems can range in complexity and size, from compact devices for medical applications to large industrial or scientific installations.
The essential functionality of a laser system lies in its ability to produce a beam of light with unique properties: spatial and temporal coherence, highly collimated direction, and a specific wavelength. This allows highly specialized uses in fields as varied as medicine, industry, telecommunications and scientific research.
Fundamental components of a laser system
active medium
The active medium is the heart of the laser system, where light amplification occurs through the stimulated emission process. It can be composed of gases, crystalline solids, semiconductors, liquids or optical fibers doped with specific elements that allow laser generation. The choice of active medium determines the wavelength, power and characteristics of the laser beam.
For example, carbon dioxide lasers use a gaseous active medium that emits in the infrared, ideal for industrial cutting and welding, while solid-state lasers such as Nd:YAG are common in medical and manufacturing applications due to their high power and precision.
Power or pump source
To excite the active medium and generate stimulated emission, laser systems require an energy source or pump mechanism. These sources can be electrical, optical or chemical, depending on the type of laser. Optical pumping uses lamps or diodes to provide energy, while electrical pumping is applied in semiconductor lasers.
The efficiency and stability of the laser system depend largely on the pump source, since this determines the amount of energy available for beam amplification and its quality. Therefore, the system design incorporates circuits and devices to control the power and duration of the pumping.