Page 102 - Chapter 3 - Fundamentals of Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
The overall pulse duration (or pulsewidth) can be summarised as T1 + T2 + T3, since these are the times when light energy is actually produced. It is reasonable to ignore the cooling gaps in such a calculation as long as they are ‘short’.
Figure 38 – A typical IPL pulse train
Some IPL systems allow the user to change these settings, while others do not. This is purely down to the design engineers of the devices. We feel, personally, that it is better to have this level of control over your device. Others may disagree with us. (They are wrong!!)
However, if your IPL will not let you change the above, do not worry. Simply use the suggested protocols later in this Chapter and hope for the best...
Difference between IPL and Diode Laser hair removal
IPL tech is more difficult to use properly! Most IPL systems allow a range of user inputs including fluence, pulsewidth, pulse train modifications, skin cooling and filters. Successful results depend very strongly on the correct choice of all of these, so a better understanding of what you are doing is required! We made a short animation to discuss this.
Most diode lasers only allow for changes to the fluence and pulsewidth, although some systems have these two parameters tied – if you change one, the other changes automatically. In this case, you should choose an appropriate fluence and let the device ‘choose’ the pulsewidth.
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