What is the wavelength of an ND YAG laser?

The ND YAG laser, which stands for Neodymium-doped Yttrium Aluminum Garnet laser, operates at a wavelength of 1064 nanometers (nm). This wavelength is in the near-infrared range of the light spectrum, making it highly effective for laser hair removal, particularly for darker skin types. The longer wavelength allows the laser energy to penetrate deeper into the skin, targeting the hair follicles effectively without causing significant damage to the surrounding skin tissue.

In contrast, the other options represent wavelengths from different types of lasers. For instance, the 694 nm wavelength is associated with the Ruby laser, which is less commonly used for hair removal due to its shorter penetration depth and suitability for lighter skin types. The 755 nm wavelength corresponds to the Alexandrite laser, which is also effective but operates differently and is generally more suitable for lighter skin tones. The 2940 nm wavelength pertains to the Erbium laser, primarily used for skin resurfacing rather than hair removal. Thus, 1064 nm is recognized as the gold standard in laser hair removal, making it the correct choice in this context.