Page 91 - Lasers and IPLs in Medical/Aesthetic Applications v1.2
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Chapter 1 – Fundamentals of Medical/Aesthetic Lasers and IPLs v1.2
Heated volume following light energy absorption
When light energy is absorbed by chromophores in the skin, heat is generated. But where is this heat generated?
Case 1 – No scattering
Let’s look at two particular cases – no scattering in the skin and ‘with’ scattering.
The image below shows a spot on the skin surface – this could be a laser pulse or an IPL shot. If we assume, in the first instance, a circular spot of radius ‘r’.
Figure 50: A spot of light energy on the skin surface
The light will penetrate into the skin to a certain depth – which depends on the wavelength and spot size.
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Chapter 1 LEVEL A Fundamentals of Lasers/IPLs
 Heated volume – no scattering
  r
Epidermis
Dermis
Subcutis
  Heated volume – no scattering
r d
Epidermis
Dermis
Subcutis
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