Page 106 - Chapter 3 - An Introduction to Laser/IPL Hair Removal
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Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
However, an IPL, which might emit a 600nm wavelength, will induce pain at 10 J/cm2 in all skin colours!
When the fluence is increased to 20 J/cm2 the pain receptors are more likely to be triggered in all skin colours for each wavelength – but the Nd:YAG is still the least likely to do so until skin colour 4 (Figure 51).
Figure 51 - Epidermal peak temperatures for four wavelengths at 20 J/cm2
At 20 J/cm2 even light-coloured skins will experience pain at the lower wavelengths – this is simply because melanin absorbs more strongly as the wavelength drops towards 400nm.With a 30 J/cm2 (Figure 52) pain is even more likely to occur in all skin colours with all wavelengths.
Figure 52 - Epidermal peak temperatures for four wavelengths at 30 J/cm2
________________________________________________________________________ 106 Chapter 3 Laser/IPL Hair Removal
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