The science behind laser hair removal

The most efficient process of removing undesired hair with the least amount of growth is laser removal. Taking a look at a firm that does Laser hair removal in Fulham it can be said that removing unwanted hair with a laser means that you use a very concentrated ray of light, a laser, which destroy the hair follicle. This advanced technology has been around for about two decades before commercial use. It became widely used in the latter half of the 1990s. A large part of the dermatology community confirms the efficacy of the method. Thanks to that, a large number of clinics, dermatologists and beauty salons practice this technique every day to make women around the world happy and hairless. The method has been proven to be quick, safe and efficient. But how exactly does it work?

The mechanism

The primary target of the laser is the hair follicle. Laser are very good for this purpose because they can be concetrated to very small points, the size of the follicle. The main principle how this method works is called selective photothermolysis. This means that laser, which is essentially light, of specific wavelenght and duration of pulse has to be produced so the effect on the tissue can be maximal, but with as little of negative effects. The target of the treatment is the hair follicle and surrounding tissue must not suffer any damage, of course. Lasers have the ability to localize the damage because they can heat up the melanin in the follicle. This increased heat causes damage to the follicle, finally causing the hair itself to stop growing. Another thing to point out that melanin is a dark pigment of the skin and light is absorbed better by dark materials. Hence people with dark skin can expect better results.

Most common wawelenghts of light which are in use for laser hair removal range from 488 nanometres to 1064 nanometres. For example, the ruby wavelength of 694.3  nm is best for very pale skin, while near infrared YAG wavelenght of 1064 nanometres is adapted for dark skin, even thought it can be used with other skin types. Other important factors when it comes to the physics of  laser hair removal are the duration of the laser, the spot size and energy density, which all have to be balanced for best results.

An important fact to point out is that the photons in the laser beam can only be absorbed by dark material, meaning eumelanin, which produces brown or black color. Best results are achieved with a contrast of light skin and dark hair, while blonde or red colored hair will not be succesfully removed with this method.

The efficiency of laser hair removal

This method is the closest thing to a permanent solution to hair removal. Even though regrowth will occur, the time passed between laser removal treatments and natural regrowth will be significantly longer when compared to other methods. Hair removal is stable and long-term, but it cannot be deemed permanent. Nevertheless, it is regarded as the next best thing to a permanet solution for unwanted hair removal.