Cosmetics

Light and especially laser light is used more and more in cosmetics. Here are some examples:

  • Epilation (hair removal): The basic principle of laser hair removal is the selective absorption of the laser light by dark object in the skin (e.g. hair or hair roots) and their destruction. This selectivity allows for a reduced influence on other parts of the skin. The hair can in some cases even work as a heat guide, i.e. the heat absorbed by the hair is guided to root and accelerate its destruction. Many different types of lasers are used for this treatment but the most usual one seems to be the alexandrite lasers (755 nm). By principle the laser hair removal is more difficult with blond hair since the selective absorption is weaker.
  • Birthmarks and hemangioma: Lasers are used to treat birthmarks that are close to the surface of the skin, such as port-wine stains. Laser therapy may also be used for hemangioma, however it is not used to treat cases where it is found on an internal organ, or deep within the skin. 
  • Fine Lines and Wrinkles: For treating lines and wrinkles, a combination of skin resurfacing and skin-tightening procedures can be performed with CO2 and Nd:YAG lasers. In some cases, such as facial treatments, less powerful lasers can be used, like e.g. laser diodes. Skin tightening is due to a controlled injury of the skin which stimulates the production of collagen.
  • Pigmented Lesions:  sun spots, age spots, melasma and other forms of hyperpigmentation can be removed with pulsed lasers (dye, Nd:YAG, et.c).
  • Laser lipolysis: laser lipolysis liquefies fatty tissue, coagulates small blood vessels, induces collagenesis and promotes tissue tightening.  
  • Laser peeling: the basic principle is simple; the laser light destroys the damaged skin stimulating its regeneration. Here also many different types of lasers are used, Er:YAG, CO2 or multiline (for a better control of the depth of penetration).
  • Tattoos: The CO2 laser and Nd:YAG remain popular for tattoo removal