Page 51 - Chapter 3 - Fundamentals of Laser/IPL Hair Removal
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Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
different form the colour of the object. You may compare this process with two magnets. Similar poles will reject each other while opposite polarity will attract to each other.
Figure 17 – Heating coloured objects with light
The fundamental concept of Selective PhotoThermolysis relies on selective light absorption and following heating of specific tissue structures.
For a deeper understanding of how selective Photothermolysis works, please view the video (right).
To achieve selective tissue heating the colour of the light versus the colour of the tissue in the vicinity of the tissue specific target is essential. To better understand this process of colour selective heating we again will exemplify sunlight exposure of objects with different colours. The sun light itself contains of all the visible colours (the ‘rainbow’ spectrum) ranging from indigo blue to deep red. The visible spectra wavelength ranges from about 400 nm (violet blue) to 750 nm deep red.
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