Gain medium is the active material in a laser source that amplifies light through stimulated emission.
The gain medium, also known as the lasing medium, is a fundamental component of a laser source where population inversion occurs, enabling the amplification of electromagnetic radiation via stimulated emission. It can be solid (crystals like Nd:YAG, ruby), liquid (dye solutions), gas (CO2, He-Ne mixtures), or semiconductor materials. When pumped by an external energy source, electrons in the gain medium are excited to higher energy states, and their subsequent decay produces coherent, monochromatic light.
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The gain medium amplifies light through stimulated emission, converting pump energy into coherent laser light, determining key properties like wavelength and efficiency.
Selection depends on required wavelength, power output, efficiency, thermal properties, and application (e.g., CO2 for cutting metals, Nd:YAG for precision machining).
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