How Lasers Work In Laser Hair Removal

How Lasers Work In Laser Hair Removal



How Lasers Work in​ Laser Hair Removal
Laser hair removal works by the​ process of​ selective targeting of​ a​ specific area of​ the​ body and using a​ specific wavelength to​ absorb light into that area .​
It does not work on​ a​ hair by hair basis,​ instead it​ focuses a​ wide beam of​ light that treats many hairs at​ one time .​
The wavelength of​ light absorbed has to​ be sufficient enough to​ damage the​ targeted tissue area while leaving the​ surrounding area basically untouched .​
The principle behind this process is​ called selective photothermolysis.
Lasers are intense beams of​ monochromatic and coherent light .​
These light beams are produced by laser devices that contain either minerals or​ gases .​
The four main types of​ lasers are solid state,​ semiconductor,​ gas and dye .​
An electric current stimulates the​ gas or​ mineral properties which excites the​ atoms .​
The atoms then emit narrow,​ cohesive,​ parallel light beams which are all the​ same wavelength .​
The light beams are focused just for​ a​ fraction of​ a​ second on​ the​ dark hair pigment at​ the​ matrix of​ the​ dermal papilla,​ which is​ the​ small,​ cone shaped indentation at​ the​ base of​ the​ hair follicle that the​ hair bulb fits into .​
The light beam is​ absorbed and heats the​ pigment which vaporizes the​ dermal papilla .​
The more intense the​ light beam the​ hotter it​ makes the​ pigment .​
This results in​ the​ dermal papilla being severely damaged or​ destroyed.
Most people believe that laser hair removal works best on​ hair that is​ in​ its anagen phase .​
This means that the​ hair is​ actively growing and is​ attached to​ the​ dermal papilla .​
The theory behind this belief is​ that if​ the​ dark pigment in​ the​ hair shaft extends all the​ way down to​ the​ dermal papilla,​ it​ will be destroyed and vaporized by the​ coherent light beam that is​ focused upon the​ area .​
This happens because the​ light beam will follow the​ dark pigment all the​ way down to​ the​ derma papilla.
Visible light has wavelengths that range from 390 to​ 770 nm,​ or​ nanometers .​
Lasers operating in​ this range allows for​ successful laser hair removal without causing any damage to​ the​ dermal tissue .​
Lasers with a​ light source that operates between 700 to​ 1000 nm targets melanin in​ the​ hair shaft effectively .​
For example,​ the​ wavelength of​ an​ alexandrite laser is​ 755 nm,​ which is​ red in​ the​ visible range of​ the​ electromagnetic spectrum,​ making its target melanin .​
The stronger,​ or​ greater,​ the​ wavelength,​ the​ deeper it​ penetrates target selectively absorbing the​ wavelength.
Laser hair removal uses several varying wavelengths of​ laser energy .​
These wavelengths range from near infrared radiation to​ visible light .​
The three most commonly used lasers for​ hair removal are Alexandrite,​ Pulsed diode array,​ and NeoDymium Yttrium Aluminum Garnets,​ Also know as​ Nd:YAGs .​
The wavelengths of​ these lasers are 755nm,​ 810nm,​ and 1064nm respectively.
Laser hair removal utilizes a​ complex system of​ science and physics which are precisely balanced to​ work effectively and safely on​ the​ human body .​
As technology continues to​ advance in​ laser hair removal,​ this process continues to​ grow in​ popularity.




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