Page 89 - An Introduction to Laser Tattoo Removal

Chapter 2 – Fundamentals of Laser Tattoo Removal v1.0
Why ‘Power Density’ is the Most Important Parameter in Clinical Treatments
Energy
Power Density
Spot size area
All three have an important effect on the reaction!
Pulse duration
Another wee technical note – power density is known as ‘intensity’ or ‘irradiance‘ in physics!
How does ‘power density’ vary with ‘focal drift’?
There are two important considerations when applying your laser energy to the skin :
2. make sure your handpiece is at ‘right angles’ to the skin, and
3. make sure it is touching the skin surface properly
The reason for the second point is quite simple – if you move the handpiece away from the skin, you might change the spot diameter which contacts the skin.
Figure 43: Moving the handpiece tip from the skin might make the laser spot smaller or larger (depending on the lens inside the handpiece). Most laser beams are focussed via a lens. This means that the spot diameter will change as the handpiece tip is moved closer to, or further away from, the skin surface. Watch a video exhibiting this.
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Chapter 2 LEVEL A Laser Tattoo Removal
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