To The Lightsheer. There are 3 important properties that lasers have that allow them to be effective for destroying hair follicles and thus cause permanent hair reduction.
Lasers are monochromatic, collimated and coherent.
Monochromatic The LightSheer Laser produces a beam of light that differs from typical light in three ways that allow it to be used for hair removal. First, it is essentially monochromatic. This means that it is of one color, which is determined by the wavelength of the light waves. This particular laser produces a near-infrared wavelength of 800 nanometers, which was selected because it is well absorbed by the melanin in hair follicles and much less so by other tissues in the area. Collimated The second important property of the laser light is that it is collimated .