Does laser cleaning cause yellowing on marble surfaces?
- Single 1064 nm ns pulses induce yellowing by preferentially ablating dark particles and thermally dissociating polar organics. Synchronous 355 nm UV removes organics first and prevents discoloration. The process remains safe below substrate damage thresholds.
Is laser cleaning practical for large facade surfaces?
- Portable systems with galvanometric scanning optics and real-time fluence adjustment process extended areas efficiently. Layer-by-layer ablation maintains uniform safety across marble, limestone, or masonry facades.
Can graffiti be removed from masonry without inducing micro-fractures?
- LQS 1064 nm at 0.6–0.9 J/cm² removes alkyd and acrylic graffiti from lime-plaster without binder cracking. Q-switched pulses above ~1.0 J/cm² risk micro-fractures. Longer pulse durations preserve substrate cohesion.
How does laser cleaning affect fire-damaged wood substrates?
- Low-fluence ablation removes carbonaceous soot layers cleanly. Water-based methods mobilize salts and exacerbate charring. Laser cleaning avoids moisture and deeper damage entirely.
