The core difference lies in the wavelength and interaction with materials. Fiber lasers emit infrared light (1064 nm) and rely on heat to melt or vaporize the surface — perfect for deep, fast metal engraving. UV lasers use a shorter wavelength (355 nm) and “cold marking” (photochemical reaction) that breaks molecular bonds with minimal heat, making them ideal for heat-sensitive materials like glass, many plastics, and delicate surfaces.[reference:15][reference:16]

Fiber lasers excel on metals: stainless steel, aluminum, brass, copper, titanium, gold, and silver. They also mark certain hard plastics (ABS, PBT, polycarbonate) but may cause slight melting on softer plastics.[reference:17][reference:18][reference:19] Fiber lasers are the top choice for serial numbers, deep engravings, barcodes, and industrial traceability on metal parts.

UV lasers are exceptionally versatile. They engrave glass (including 3D internal engraving), almost all plastics (ABS, PC, PVC, silicone, acrylic) without melting, wood (no burning), leather, ceramics, stone, and even coated/anodized metals.[reference:20][reference:21] UV lasers also work on “difficult” materials that fiber lasers struggle with: transparent objects, paper, fruit, fabrics, and electronic components.

UV lasers are significantly more expensive — typically 1.5 to 2 times the price of a comparable fiber laser system.[reference:32] The reason is the complex frequency-tripling technology needed to produce a 355 nm beam. Fiber lasers, on the other hand, offer better value for metal-dominant work and have extremely low running costs.

However, UV machines may be more cost-effective for high-mix, low-heat applications where delicate materials would be destroyed by fiber lasers.

Fiber laser wins on every metal parameter: speed, depth, contrast, and durability. Fiber lasers mark stainless steel, aluminum, titanium, and even highly reflective metals (gold/silver) with permanent high-contrast marks. UV lasers can mark coated or anodized metals without damaging the coating, but for bare metal, deep engraving, or industrial traceability, fiber is the proven champion.[reference:33][reference:34]

Yes, but with limitations. UV lasers mark coated or anodized metals beautifully, removing the coating precisely without heat damage.[reference:35] On bare metals, UV marks are usually lighter and shallower, lacking the high contrast and depth of fiber lasers. For heavy metal removal or deep engraving, fiber remains the go-to tool.

Fiber lasers are nearly maintenance-free, air-cooled, and last >100,000 hours.[reference:36][reference:37] UV lasers require a water chiller and regular cleaning of optics; their laser crystals degrade faster, often needing replacement after ~20,000–30,000 hours of heavy use.[reference:38] UV systems also involve higher upkeep due to the complexity of the resonator.

It depends on your main materials: If you mostly work with metals (jewelry, tools, industrial parts) → fiber laser gives faster ROI, lower running costs, and exceptional durability. If you work with glass, acrylic, electronics, or mixed materials → UV laser offers unmatched versatility and cold-marking safety. Many businesses later upgrade to a dual-laser setup (UV + fiber) to cover all applications.

For hobbyists or small workshops, a lower-cost fiber laser (20W) or an entry UV galvo can be a great starting point.