How Laser Hair Removal Actually Works

Laser hair removal works by targeting the melanin pigment inside each hair follicle. When the laser beam is absorbed by the melanin, it converts to thermal energy that damages the follicle's growth cells, preventing future hair production.

At Peach Lasers in Calgary, we use a 4-wavelength Diode Laser system operating at 2,500 watts that fires four wavelengths simultaneously: 755nm (Alexandrite-class for fine hair near the surface), 808nm (gold standard diode for deep follicle penetration), 940nm (expanded spectrum optimized for diverse skin tones), and 1064nm (Nd:YAG-class that safely bypasses surface melanin for dark and tanned skin).

The system's AI Hair Follicle Scanner analyzes each client's hair density, colour, and skin type to auto-calibrate the optimal energy level, pulse width (2 to 125 milliseconds), and spot size. A triple-cooling system using water, air, and semiconductor technology chills the handpiece to sub-zero temperatures before each pulse, numbing pain receptors milliseconds before the laser energy is delivered. Most clients describe the sensation as similar to a cool stone massage.

Hair grows in three phases: anagen (active growth), catagen (transition), and telogen (resting). Laser hair removal only affects hair in the anagen phase, which represents 10 to 25 percent of hair at any given time. This is why multiple sessions, typically six, spaced four to six weeks apart, are required to achieve 90 percent or greater permanent hair reduction.