What is a Laser?

Dermatological laser techniques have been developed for medical and cosmetic purposes for the last 15 years.

However, high technology lasers may lead to complications if used with incorrect parameters or misused. Mastering laser theory elementary rules is fundamental in view of the high number of lasers available on the market and their increasing complexity.

Laser theory will enable laser users to safely and adequately adapt laser treatment to each of the patients.

What is a Laser?

A laser is a source of coherent light emitting at a given wavelength with a variable fluence. This light enables a transport of energy which reaches its target located in the skin.

What Purpose does the Laser Serve?

The purpose of laser treatment is to destroy a very specific part of the skin without hurting the epidermis and hence, without leaving scars.

Therefore, it is currently possible to treat erythrosis, child and adult port wine stains, brown spots, tattoos, cutaneous ageing signs and hyper-distribution of hair. The laser emission wavelength determines its specificity.

Laser Treatment Targets in Dermatology

Light is being absorbed by the skin thanks to its 3 chromophores: hemoglobin, melanin and water. Absorption rate varies according to wavelength. In order to be the most precise, it is essential to choose the right wavelength, meaning the wavelength that will be best absorbed by the identified target and the least by the other chromophores.

  • Red colour: Erythrosis and Angioma
  • Brown colour: Brown spots, Tattoos and Hair removal
  • Water: Cutaneous ageing signs and Wrinkles