Wavelength, pulse behaviour and beam delivery determine which process is possible. This guide explains the source physics behind the current xTool range without reducing the decision to wattage.
Laser “power” is only meaningful after wavelength, beam delivery and pulse regime are known. A 5W UV source can outperform a much higher-power visible source on a fine polymer-marking task; an 80W CO₂ source can be vastly more useful for transparent acrylic cutting than a nominally powerful blue diode; a 60W MOPA system can control metal surface response in ways a simple continuous/fixed-pulse comparison cannot.
Compact solid-state source. Strong practical fit for wood, card, leather, coatings and dark/opaque acrylic; absorption is poor in some transparent materials and bare metals.
Far-infrared gas laser. Excellent interaction with many organics and acrylic, making it the conventional route for production cutting of these sheet materials.
Near-infrared source used for metal and polymer marking. Fibre systems can reach much higher useful metal-removal rates than low-power DPSS IR modules.
The wavelength is similar to fibre, but pulse width/frequency flexibility changes energy delivery and expands process control for colour marking and surface engineering.
Short wavelength with higher photon energy. Particularly useful for fine marking, glass/crystal workflows and plastics where a smaller thermal footprint is desirable.
A laser only becomes useful after the workpiece absorbs enough optical energy in the relevant region. Reflectivity, absorption depth, thermal conductivity, phase changes and decomposition behaviour then determine whether the result is clean cutting, surface colour change, ablation, melting or an unacceptable heat-affected zone.
This is why “can engrave metal” is too vague to be an engineering specification. A coated aluminium tag, a deep brass serial, stainless colour marking and a mark on a moulded polymer housing can all be called metal/plastic engraving but demand different energy coupling and process control.
| Source | Representative xTool | Where it is strongest | Where we would not start |
|---|---|---|---|
| Blue diode | S1 / F2 diode channel | Wood, leather, coated surfaces, dark acrylic, general cutting/engraving | Transparent acrylic cutting; deep bare-metal work |
| CO₂ | P3 | Wood/acrylic production cutting, larger sheet work | Fine direct metal marking without another source/process |
| 1064 nm IR | F2 IR / S1 IR module | Permanent marking of many metals and plastics | High material removal or deep metal engraving |
| 20W fibre | F1 Ultra | Deeper metal engraving, durable marking, some thin-metal cutting | Large sheet cutting |
| 60W MOPA | F2 Ultra | High-throughput metal engraving, embossing, stainless colour process tuning | Users who only need occasional shallow marks |
| 355 nm UV | F2 Ultra UV | Fine glass/crystal/plastic work, low-heat marking, internal crystal engraving | General-purpose thick sheet cutting or deep metal removal |
MOPA (master oscillator power amplifier) systems give the process engineer a wider parameter space for pulse duration and repetition behaviour. On stainless steel, for example, different combinations of pulse energy, overlap, frequency and scan strategy can generate different oxide-film conditions and therefore different colours. The useful feature is controllability, not the marketing label itself.
The current xTool example of a high-power MOPA + diode system; its value is in repeatable metal process development and production throughput.
D&L view: Choose it for metal process capability, not merely because 60W is the largest number on the page.
Check current price at xTool UK →At 355 nm, the photon energy is higher than at visible/near-IR wavelengths. In suitable materials that can shift the balance toward photochemical bond breaking and very localised ablation rather than bulk heating. In practice, “cold processing” should still be treated as relative: energy is being deposited and local heating can still occur. The engineering advantage is the ability to achieve fine, high-contrast marks on materials that respond poorly to longer wavelengths.
A 5W 355 nm specialist with 200 × 200 mm surface field and a separate 70 × 70 mm inner-engraving field.
D&L view: Use when UV-specific material response is the reason for purchase.
Check current price at xTool UK →Optical source selection does not remove the need for containment, interlocks, extraction and material control. The hazard class of the complete machine depends on the accessible radiation in normal use, not simply the laser source inside it. Separately, cutting or ablating material produces particulate and/or gaseous emissions that must be controlled.
Clear acrylic strongly absorbs the 10.6 µm wavelength used by CO2 lasers, while visible blue light can pass through it with much weaker absorption. The source wavelength therefore matters more than simply comparing watts.
MOPA is a fibre-laser architecture with much wider pulse-width and frequency control. That extra process control can improve colour marking and optimisation across different metals, but it does not make every job faster or better automatically.
355 nm UV systems couple well to many glass, crystal and technical-polymer applications and can create fine marks with a smaller heat-affected zone. They are specialist tools rather than general replacements for CO2 or fibre machines.
