What Is a Laser Crystal? — The Core Engine of Solid-state Lasers
Category:
Industry News
Release date:
2025-09-09
Laser crystals are the active materials that convert externally supplied energy into laser light via stimulated emission; they are optical crystals doped with specific activator ions.
Its working principle is primarily based on three fundamental processes:
Pump: An external light source (such as a laser diode) illuminates the crystal, causing its internal activated ions (e.g., Nd³⁺, Yb³⁺, Er³⁺) to transition from lower energy levels to higher ones.
Population Inversion: The number of particles in a higher energy state exceeds that in a lower energy state—this is a prerequisite for laser generation.
Stimulated Emission & Amplification: When photons pass through a crystal in a state of population inversion, they trigger the emission of additional, identical photons. These photons bounce back and forth within the laser resonator, continuously amplifying each other until a highly intense, highly directional laser beam is produced.
Therefore, the performance of laser crystals directly determines the output wavelength, power, efficiency, and quality of the laser.
Keywords:
Laser crystal
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