FeatherPulse 300 W Laser Cleaning Reference Parameter Matrix – Start-up Settings (adjust on coupon first) Coating / Layer Pulse-width (ns) Repetition-rate (kHz) Pulse-energy (mJ) Spot Ø (mm)* Fluence (J cm⁻²) Scan-speed (mm s⁻¹) Passes Avg. Power (W)** Notes Epoxy/Polyuret hane Primer 80 – 100 25 – 40 5 – 10 0.7 ±0.1 3 – 7 250 – 400 1 – 2 ≤ 250 Stop when yellow/green primer gone; substrate still dull-grey. Threshold ≈ 5 J cm⁻². Acrylic Polyurethane Top-coat 90 – 120 12 – 20 15 – 25 0.6 ±0.1 17 – 25 120 – 250 2 – 4 ≤ 300 Layered depaint: aim for white primer breakthrough; damage threshold ≈ 25 J cm⁻². Anodic Oxide Film (2–4 μm) 60 – 90 30 – 40 4 – 6 0.8 ±0.1 1.5 – 3 300 – 450 1 ≤ 240 Remove chalky oxide bloom; do not polish to mirror. Cleaning threshold ≈ 1.8 J cm⁻². *Spot diameter measured at 1∕e². **Average power = pulse-energy × rep-rate. Keep substrate < 120 °C (IR sensor). Quick Fluence Formula Fluence (J cm⁻²) = Pulse energy (J)0.785 d2\dfrac{\text{Pulse energy (J)}}{0.785·d^2} where d is spot diameter in cm. ⋅
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