Lasers are classified by both wavelength and maximum output power into four basic classes which categorize them according to their ability to produce damage to people operating them, from Class 1 (no hazard during normal use) to Class 4 (very hazardous for eyes and skin). Lasers used for welding, marking and cutting are generally Class 4 lasers.
操作4级激光时， 关键在于 通过使用正确的安全眼镜保护操作区域内的自己和他人，并将激光设备置于室内和/或以特殊障碍物围绕的地方，以保护旁观者不与激光束直接接触。
Most laser workstations used in manufacturing are built to be integrated with Class 4 lasers and house the laser beam securely in an enclosure that is both interlocked and fixed with a laser-safe viewing window. The integration of a Class 4 Nd:YAG laser for welding, for example, into a Class 1 enclosure creates a safe, Class 1 environment.
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