What is the main operational difference between CO2 and Fiber laser engravers in this catalog?

 CO2​ lasers emit a 10.6μm wavelength ideal for organic substrates (wood, leather, paper, acrylic, glass, coated metals). Fiber lasers emit a 1.06μm wavelength designed for direct marking on raw metals (stainless steel, brass, titanium, aluminum) and dense engineering plastics without needing chemical marking sprays.