Page 134 - Lasers and IPLs in Medical/Aesthetic Applications v1.2
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Chapter 1 – Fundamentals of Medical/Aesthetic Lasers and IPLs v1.2
Appendix 3 - Calculating the Fluence (Energy Density)
Knowing the fluence (or energy density) is very important in laser/IPL skin treatments. It is, therefore, important to know how to calculate the fluence you are applying to the skin surface. (What is fluence again?)
The following video may help....
To calculate the fluence of your laser you need to know two things:
the energy in your pulse, ‘E’;
the spot diameter on the skin surface, ‘d’.
The first of these must be measured using an appropriate meter – there is no other way of doing this!
The second may be found by firing the laser energy at a dark piece of paper or laser burn paper. This should generate a burn pattern which can be measured.
Once you know these you can then calculate the fluence by dividing the energy, E, by the sport size area, which is  (d/2)2 or r2 (where ‘r’ is the radius).
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Chapter 1 LEVEL A Fundamentals of Lasers/IPLs
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