Page 88 - Chapter 3 - Fundamentals of Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
Figure 30 – Diode lasers are essentially electronic devices. See ‘www.explainthatstuff.com’ for more info
Triple wavelength diode lasers...
A recent development in diode lasers has been the introduction of three wavelengths in one head - typically this is a collection of three sets of laser diodes. The reality is that some of those devices really do emit three wavelengths, while others do not! The difficulty is that it is very difficult to tell without a spectrophotometer (a device which can measure wavelengths). The human eye cannot differentiate between these wavelengths since they are all outside our optical range.
Some systems adopt an ‘interlacing’ system where the diodes are placed with consecutive wavelengths (see figure to the left).
Figure 31 – Interlacing three different diode lasers into one block
The diode laser block above outputs three wavelengths – 755, 808 and 1064nm. Note that although the 755 and 1064nm are normally associated with alexandrite and Nd:YAG lasers, this multiple wavelength block is ALL diode laser – it does NOT contain an alexandrite and/or an Nd:YAG laser.
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