ABSTRACT
The Q-switched Nd:YAG laser emits a 1064 nm wavelength beam with pulse duration of 10 ns. Melanin is not a good absorbing chromophore of 1064 nm wavelength (Figure 4.1). Thus, 1064 nm Q-switched Nd:YAG lasers have never been ideal for the treatment of benign pigmented lesions. Despite less melanin absorption of the 1064 nm wavelength, as compared to ruby, alexandrite, and diode wavelengths, the Nd:YAG laser’s advantage lies in its ability to penetrate more deeply in the skin (up to 4-6 mm). The nanosecond Q-switched Nd:YAG laser’s effect on hair is one of photomechanical damage. In order to induce a photothermal effect on treated hairs, a millisecond Nd:YAG laser must be used.
