Buyer Guide

Pulsed vs CW Laser Cleaning

Choosing between pulsed and continuous wave laser cleaning is the most important decision when specifying a laser cleaning machine. Both technologies use fibre laser sources and clean by ablation — but they behave very differently. Here is a practical guide.

The Core Difference

Pulsed Laser

Fires discrete bursts of laser energy. Each pulse delivers very high peak power in a fraction of a millisecond, then switches off. The contaminant absorbs and ejects the energy before it transfers as heat to the base material.

High peak power, moderate average power
Minimal heat transfer to substrate
Safe on delicate or thin materials
Adjustable pulse duration and frequency
ApexLase ARC series: 300W–1000W

Continuous Wave (CW) Laser

Emits a constant, uninterrupted beam. Energy delivery is consistent and continuous, producing high average power that cleans quickly but generates more sustained heat at the surface.

High average power, continuous output
Faster cleaning on heavy contamination
More heat input to substrate — not for delicate materials
Water-cooled for sustained industrial duty
ApexLase ION series: 1000W–3000W

Side-by-Side Comparison

FactorPulsed (ARC)CW (ION)
Beam typePulsed burstsContinuous
Peak powerVery highModerate (= average power)
Average power300W–1000W1000W–3000W
Heat to substrateMinimalModerate to high
Delicate substratesExcellentNot recommended
Heavy industrial contaminationGoodExcellent
Cleaning speed (heavy rust)ModerateFast to very fast
Thin sheet metal / panelsSafeRisk of distortion
Restoration workIdealGenerally unsuitable
Robotic / inline integrationPossibleCommon
CoolingAir (lower power) / WaterWater-cooled
UK power range300W–1000W1000W–3000W+

Choose by Application

Choose Pulsed when you need:

  • Non-destructive rust or paint removal from thin or complex metal
  • Classic vehicle or aircraft restoration
  • Heritage ironwork or architectural metalwork
  • Precision mould and die cleaning
  • Delicate substrate protection
  • Portable, flexible workshop use

Choose CW when you need:

  • Maximum cleaning throughput on heavy rust or mill scale
  • Large-area structural steel preparation
  • Pipeline descaling and maintenance
  • Shipyard hull preparation
  • Industrial batch cleaning where speed is the priority
  • Robotic or automated cell integration

Not sure which is right for you?

Tell us your substrate, contamination, and throughput target. We'll make a clear recommendation with UK pricing.