how do lasers remove rust from rust without burning through the whole thing?

Question

Can anybody explain the types of lasers and how it works?

In: 1

Answer 1

Rust is dark and the underlying metal is light. The laser light quickly heats up the surface and the difference in temperatures causes the rust and contaminants to change size at a different rate than the substrate and thus leave the surface. It kind of blasts the rust with energy causing it to pop and blow off.

https://www.p-laser.com/about/the-technology

https://www.laserax.com/blog/how-does-laser-cleaning-work