Laser hair removal is becoming an increasingly popular alternative to traditional methods of struggle with unwanted hair, such as shaving, waxing waxing, depilatory creams and electrolysis. Although photomechanical technology is considered the most secure, photothermal technique (laser) is more radical in terms of getting long-term epilation effect.
However, laser hair removal can lead to thermal damage to the upper layers of the skin, which is often (but not always) can manifest as undesirable from an aesthetic point of view, blisters and uneven pigmentation. The probability of these side effects are especially high for the ruby, alexandrite and diode lasers (see below).
Today, there are only a few laser techniques have received universal recognition. These techniques are usually based on clinical findings, objectivity proven by numerous data obtained in different research centers.
Common to all laser techniques is that the impact of laser light on the hair can be made of non-contact once a relatively large area of skin. The specific physical properties of laser radiation and the structure of the hair follicle including, hair can affect selectively. This means that the damage is applied to the hair without affecting the basic vital functions of the surrounding tissue. To achieve the desired effect, ie, prevent the growth of 90% of hair is required to hold several, usually three to five sessions over 4-8 months of treatment. Learn more about Laser hair removal side effects!
Despite the characteristic features in common, there are, nevertheless, some differences in laser technology and techniques associated mainly with the types of lasers used.
A long-ruby laser
The effectiveness of a ruby laser as the epilator is strongly dependent on the color of the hair removed. Blonde and red hair practically not removed, because the weakly absorb “red” laser beam.
A long-alexandrite laser
Methods of hair removal is almost the same as that of the ruby laser. Unlike the ruby laser is that the Alexandrite – this is a leaner and more “fast” laser.
A long-broadband light source
In contrast to the ruby and alexandrite lasers, broadband source allows waxed red and blond hair. But this hair removal process management requires a strong enough software to account for the type of hair and skin. Broadband pulsed source, intended for hair removal, is still relatively complex and expensive device.
All of the above technologies require additional cooling the skin during the procedure to avoid burns and giperpigmentatsionnyh changes since the heating of tissue is practically impossible to avoid.
In early 1998, developed a somewhat different, different from those discussed above, laser hair removal technology. It is based on the phenomenon of the theory of the photomechanical effect. This theory does not require coagulation associated with heating the hair structure.
Short-pulse high-energy neodymium laser
Neodymium laser beam penetrates directly to the hair. In the skin, do not get the energy flows, is inevitably transformed into heat, and that should be output using the appropriate cooling devices. A comparative picture between long-and ultrakorotkoimpulsnymi lasers can be represented as follows:
A long-laser and a broadband light source is damaging the hair structure from the outside, heats a large volume of tissue. The entire structure of hair surrounding volume of tissue is under continuous and intense heat exchange with external cooling devices.
High-energy neodymium laser ultrakorotkoimpulsny damaging the hair structure from within. In this current processes do not affect the surrounding tissue.
The importance of hair removal session is not only that the structure of the hair is removed, as such, and that broken links are responsible for the reproduction of new hair growth and hair covered source of replenishment of the new generations. Thus, despite the fact that 1 month after the first treatment can re-grow hair up to 70%, most of them will no longer be in the anagen (active) phase. After the second session, after 3 months, can grow up to 40% of the hair. The third session will reduce the number of generic hair up to 10%, etc.
This is only an approximate dynamics of hair removal. It can vary depending on the technology. For example, the rate of hair removal using a neodymium laser usually consists of “active” stage (1 session every two weeks a month). Next – “preventive” – the stage is made up of one session every three months or more as needed.
Presented in the paper technology define the main trends in the development of laser methods of hair removal, despite the existence of several other methods, not considered by us: photodynamic therapy, a method of hair removal using photomechanical hromoforosoderzhaschih lotions, etc.