Which wavelength is associated with Diode lasers?

• A. 1064nm
• B. 810nm
• C. 755nm
• D. 590nm

Answer: (B)

In hair-removal lasers, the wavelength determines how well the hair pigment absorbs the light and how deeply the light can reach the follicle. Diode lasers are known for emitting near-infrared light around 800–810 nm. This range is strongly absorbed by melanin in hair and penetrates enough to reach the follicle, while still allowing safe epidermal cooling to protect the surface. That makes 810 nm the classic diode laser wavelength.

The other options come from different laser technologies: 1064 nm is Nd:YAG, offering deeper penetration and different safety profiles; 755 nm is Alexandrite, a separate system; 590 nm is a visible yellow used for other indications like vascular lesions, not diode hair removal. So 810 nm is the wavelength most associated with diode lasers.