Laser Marking Services

Introduction

Direct part marking has become indispensable in modern manufacturing. Automotive parts need durable serial numbers, medical devices must carry Unique Device Identification (UDI) codes, and consumer goods often feature elegantly branded logos. Laser marking – the use of a focused beam of light to create a permanent mark – has emerged as the technology of choice because it is fast, versatile and virtually consumable‑free. The process can use fiber, CO₂, UV and other lasers to engrave, etch or anneal materials, delivering crisp barcodes and data‑matrix codes with high contrast. In this article BACH INDUSTRY AG explains how laser marking works, compares available technologies and offers guidance on choosing the right industrial laser marking machine for your business. As a supplier and integrator serving Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa, we combine technical expertise with competitive pricing and after‑sales support.

How laser marking works

Laser marking systems generate a coherent beam of light that contains high levels of energy. When the beam strikes a surface, it transfers heat that either changes the material’s colour, causes localised oxidation, or ablates material. The science behind lasers – “Light Amplification by the Stimulated Emission of Radiation” – relies on exciting a medium to release photons and then directing those photons in a single beam.

The marking, engraving and etching processes all rely on this principle but differ in how the material is affected. Laser marking discolours the surface without removing material, making it ideal for barcodes, UID codes and logos. Laser engraving vaporises material to form a cavity, while laser etching melts the surface to produce a slightly raised mark. Laser marking produces high‑contrast marks with minimal heat input and is particularly popular for stainless steel, titanium and some plastics.

Choosing the right laser marking technology

Fiber lasers

Fiber lasers use a doped optical fibre as the lasing medium and pump it with a diode. They emit light around 1.06 µm, which is readily absorbed by metals. This small focal diameter can concentrate intensity up to 100 times higher than CO₂ systems and produces fine marks with superb contrast on metals, including aluminium, stainless steel and brass. Key advantages include minimal maintenance, long service life (often exceeding 100 000 hours) and high electrical efficiency. Fiber lasers consume far less power than CO₂ lasers and eliminate consumable costs such as gas tubes. BACH INDUSTRY AG offers handheld fiber laser marking machines, desktop fiber laser marking machines, portable units and enclosed workstations to suit different production environments.

CO₂ lasers

CO₂ laser marking machines generate far‑infrared light (~10.6 µm) using a mixture of carbon dioxide, nitrogen, hydrogen and helium. They excel at marking non‑metallic materials such as plastics, textiles, wood, glass and acrylic. CO₂ lasers are generally slower than fiber lasers and have lower photo‑electric conversion efficiency – only about 10‑15 % compared with 35‑50 % for fiber lasers. However, they are versatile and often have a lower initial purchase price. For thick organic materials or wood engraving, a CO₂ laser marking machine remains a cost‑effective choice.

UV and MOPA lasers

Ultraviolet (UV) laser markers operate at wavelengths below 400 nm. They can produce extremely fine marks with minimal heat, which is why they are used on sensitive materials like certain plastics, glass and medical packaging. A comparison by Videojet notes that fiber lasers are ideal for high‑density materials and high‑speed applications, while UV lasers are preferred where minimal heat input is required. MOPA fiber lasers allow pulsed output control, which is useful for colour marking on stainless steel and for plastics that would otherwise melt.

Selecting a laser type

Selecting the right laser marking system depends on your material, desired mark quality, throughput and budget. Fiber lasers provide the best performance on metals and offer long lifetimes. CO₂ lasers are better for thick or organic materials. UV lasers should be considered when marking sensitive plastics or components that cannot tolerate heat. BACH INDUSTRY AG helps customers evaluate fiber vs CO₂ vs UV options and offers high‑speed, 3D, CNC, and inline/on‑the‑fly laser marking machines for integration into production lines.

Materials and applications

Laser marking can be applied to a wide range of materials. Metals such as steel, aluminium and stainless steel absorb the 1.06 µm wavelength emitted by fiber lasers well, which is why fiber lasers produce deep, permanent marks on engine blocks, pistons and serialised components. Stainless steel marking produces corrosion‑resistant marks; fibre lasers offer excellent precision and energy efficiency. For brass or copper components, fiber lasers’ shorter wavelength reduces reflection and minimises risk to the laser source. CO₂ and UV lasers are suited to plastics (polycarbonate, ABS, nylon, HDPE, polypropylene) and organic substrates like wood or leather. With the right laser marking software and controllers, a single system can mark metals, plastics and even circuit boards.

Applications span numerous industries. In automotive and aerospace, fiber lasers enable permanent, high‑contrast identification of engine parts, VINs and unique identifiers that must comply with traceability standards. Electronics manufacturers use fiber lasers to engrave micro‑barcodes on printed circuit boards and metal components. Medical device laser marking machines deliver UDI‑compliant codes that survive sterilisation; marking experts note that direct part marking is often the only technology capable of withstanding passivation and sterilisation cycles while producing high‑contrast marks in small areas. In craft and signage, CO₂ lasers offer smooth engravings on wood, acrylic and leather at an attractive cost. For packaging, UV lasers can code plastics without heat damage.

Compliance and coding

Modern regulations demand legible, permanent identifiers. A UDI (Unique Device Identification) label for medical devices consists of a Device Identifier (manufacturer and model) and an optional Production Identifier (lot number, serial number or date). The FDA’s UDI rule, introduced in 2014 and fully implemented in 2020, requires these codes to be applied directly to the device for reusable instruments. Laser marking meets this need because it produces high‑contrast, durable marks that survive sterilisation and wear. In other industries, manufacturers use laser markers to engrave QR codes, barcodes, data matrix codes and logos for product identification and anti‑counterfeiting. BACH INDUSTRY AG provides laser marking validation and UDI marking services and offers accessories such as fume extractors, rotary fixtures, laser marking plates, labels, tapes and metal marking sprays to ensure a complete solution.

Parameters and mark quality

Achieving high‑quality laser marks requires careful parameter selection. The power, pulse frequency and scanning speed determine mark depth, contrast and cycle time. For example, higher power and lower speed produce deeper engravings, while lower power and faster speed allow surface annealing. Beam focus, hatch spacing and orientation also affect resolution and heat‑affected zones. Proper settings minimise heat build‑up, which in turn ensures that delicate plastics or thin metals are not distorted. BACH INDUSTRY AG uses advanced laser marking software (including EZCAD for fiber systems) to optimise hatch contour generation, marking parameters and cycle time. Our engineers validate that each precision laser marking job meets the required resolution, depth and quality standards.

Conclusion

Laser marking is a versatile, precise and increasingly indispensable technology. By understanding the differences between fiber, CO₂, UV and MOPA lasers and evaluating materials, applications and compliance requirements, manufacturers can select equipment that delivers lasting value. Fiber lasers offer unmatched efficiency and durability on metals; CO₂ lasers remain the choice for organic materials and budget‑sensitive projects; UV lasers address sensitive plastics and micro‑marking needs. Market trends point to sustained growth as industries embrace traceability and green manufacturing.

BACH INDUSTRY AG offer laser marking services and assist with validation and rework. Contact us to explore how our innovative equipment and support can enhance your manufacturing processes and ensure compliance with the latest standards.