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In a fiber laser cutting machine, the laser amplifier is a crucial component that enhances the power of the laser beam to achieve efficient and precise cutting of materials. 

The laser beam then passes through a fiber laser amplifier. In the case of fiber lasers, the amplifier is often a section of optical fiber doped with rare-earth elements like erbium or ytterbium. These dopants help in the amplification process.

When the laser beam travels through the doped fiber, it stimulates the dopant atoms to emit additional photons, resulting in the amplification of the laser beam. This process is known as stimulated emission.

The amplified laser beam exits the amplifier with a higher power level than it entered. This increased power is crucial for efficient material processing in laser cutting applications.

The amplified laser beam is then directed through focusing optics onto the material being cut. The high power density of the laser beam enables precise and clean cuts through a variety of materials, including metals and composites.

Fiber laser cutting machines are known for their high efficiency, reliability, and precision. The use of fiber amplifiers contributes to these characteristics by providing a compact and efficient means of boosting the laser power.