Best laser hair removal results can only be achieved through the selection of appropriate laser parameters for the person under consideration. This is an important step which should not be overlooked otherwise best laser hair removal results cannot be achieved.

There are certain consumer prospects which should be taken care while choosing laser for laser hair removal. There is no hard and fast rule for that but following things should be kept in mind to achieve best laser hair removal results and minimizing the laser hair removal side effects. Laser hair removal results depend on the following facts which affect the results greatly,

Spot Size

This is in fact the area of skin covered by a laser pulse .The lasers with larger spot size are more useful, because they cover much more area. This in turn saves time. For example, a laser hair removal treatment of the back or full legs used to take as long as 2 hours with older lasers. Today, these areas can be completely treated in less than 20 minutes with the help of larger spot sizes up to 18mm it is time saving both for client and practitioner. Also the lasers with large spot size are more effective in treating large areas with ease.

Cooling Systems in Laser

Every laser has its different way of cooling the skin. Following are the four cooling systems used:-

• Contact cooling
• Cooling gel
• Dynamic cooling
• Cold airflow:

But the most safe and best way to cool the skin is Dynamic Cooling Device .This method uses short cryogen (cooling substance) spurts delivered on the skin surface by an electronically controlled valve . The amount of the cryogen depends upon the spurt duration .The drops of cryogen strike the hot skin surface and evaporate .This evaporation causes the cooling of the skin taking away with it the heat energy of laser . This method gives fast and selective cooling .This method is most suitable for laser hair removal. So, while opting for a laser treatment this should be given a special consideration.

Frequency of Laser

Different laser lights with different wavelengths have been used for hair removal, these range from visible light to near-infrared spectrum. These lasers are usually differentiated on the basis of medium used to create the respective wavelength (which is measured in nanometers nm):

• Ruby laser 694 nm
• Alexandrite laser 755 nm
• Pulsed diode laser 810 nm
• Nd:YAG laser 1064 nm

Many different lasers are effective in hair removal. Light skin can be safely treated with most laser hair removal systems. For safely treating dark skin usually Alexandrite lasers, Diode lasers or long pulsed Nd:YAG lasers are recommended. For dark skinned individuals, the energy level should also be reduced to ensure safety, which may increase the number of treatments with the laser in order to obtain completely rid of the hair. A long pulsed Nd:YAG laser can be employed to safely treat a tanned skin person.

Fluence

Fluence or energy level is also an important aspect which should not be overlooked during laser hair removal procedure. It is measured in Joules per square centimeter, (J/cm2). This should also be considered when planning a laser hair removal procedure procedure because it should be in the safe limits or otherwise it can cause harm to skin, especially in photo sensitive persons.

Pulse Width

Pulse width also carries great importance. Various published studies support the fact that longer pulse widths might be more effective with low incidences of side effects. Some say that, very long pulse or super long pulse lasers might be more safe for people with darker hair types, but there is no published clinical data to support this claim.

Laser energy per unit area

Amount of laser energy required varies from client to client and it is estimated before treatment by test doses given to particular area to be treated.