Selective thermolysis : definition
When the light ray reaches the skin, a part
of it penetrates the surface layers. It may then be absorbed by skin chromophores.
When absorbed, it is transformed into heat. Selective photothermolysis is the
specific action of heat resulting from light aimed at a specific target.
Targets
The main skin chromophores are melanin, haemoglobin
and water. Each chromophore has a different absorption capacity depending on
wavelengths used. Perfect wavelength selection is essential for selectively
reaching a precise target.