What is laser
A laser is a device that emits ultraviolet, visible and infrared electromagnetic radiation by employing the process of stimulated emission. The word is an acronym standing for Light Amplification by Stimulated Emission of Radiation. Pulsed lasers allow large pulse energy build-up and very short pulse duration.
How lasers clean surfaces
Laser cleaning is based on the laser ablation phenomenon, which consists in evaporating material from a solid surface. The material sublimates, thus omitting the liquid phase and turning directly into gas or plasma.
Cleaning historic surfaces by irradiating them with a laser beam is a method that can be characterized as:
contactless with little effect on the substrate being cleaned – the only cleaning medium is light
selective – the beam "differentiates" between contaminants and the substrate
local and precise - the beam with a properly configured energy density removes deposits only from the exact spot it is directed at
universal – it can be applied to a variety of substrates and contaminants, perfectly complementing traditional treatments (mechanical and chemical), wherever they prove ineffective
environmentally friendly – no refuse, waste or dust is produced; no harmful substances are used; power supply is the only requirement.
www.youtube.com/watch?v=5vAllaD6DbQ (Royal Baths, Warsaw)
www.youtube.com/watch?v=UPrA_LWX2pA&list=PL9488BFABRCC4BOFB&index=12 (Cathedral in Toruń)