Control Unit
Refraction bends the light in an optical laser. An optical fiber cable carries the light through a transparent, silica-free core. The core is coated with cladding. Cladding is another layer of silica doped in additional materials to lower the refractive index. Because they have a different refractive Index, the light will become refracted at their core-clad interface.
When it comes to cutting various Fiber laser machines are more efficient at cutting thin metals. A fiber laser machine can cut thin metals efficiently up to 25mm or 1 inch. After that, fiber lasers start cutting metal less efficiently. You would need high amounts of power, which by the way cost a lot more money, to cut ticker metals above 25mm or 1 inch.