The ruby laser
The q-switched ruby laser (wavelength 694nm) was the first laser to be invented in 1960 and emits red light at extremely short pulses (20-40ns pulse length).
With this high-energetic light, disturbing pigments in the skin may be selectively destroyed. The treatment is suitable for the scarless removal of tattoos as well as removal of pigmentary changes such as old age spots (seborrheic keratoses) or acquired pigment changes. Tattoos by lay people can be removed more easily than professional tatoos, as the latter may use more pigment as well as different pigments.
Further development of the ruby laser has led to the euipment of this laser with a special unit that allows for longer impulses, thus making this laser suitable for permanent laser hair removal.
