Page 61 - Chapter 3 - Fundamentals of Laser/IPL Hair Removal
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Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
Device parameter settings that are safe for treatment of one individual with skin type III may cause severe side effects on another individual with same Fitzpatrick skin type!
Fitzpatrick Type
Low abs %
High abs %
Average %
1
0.5
1.5
1
2
1.5
4
2.75
3
4
8
6
4
8
16
12
5
16
32
24
6
32
43
36
Table 8 – Absorption of light energy compared with skin types
Epidermal peak temperatures for three fluences
Most pain experienced in laser/IPL hair removal is directly attributed to the high temperatures attained in the epidermal basal layer where the melanin absorbs a significant proportion of the incoming light energy. This absorption depends greatly on the wavelength(s) of the light since this determines the absorption coefficients. It is easy to calculate the resultant temperature rise for each wavelength, given the fluence.
Error! Reference source not found. shows the temperatures attained for four wavelengths with an applied fluence of 10 J/cm2 at the skin surface, over six skin colours (melanin concentration ranging from 5 to 43%).
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