What wavelength is associated with Diode lasers?

• A. 755nm
• B. 1064nm
• C. 900nm
• D. 810nm

Answer: (D)

Diode lasers used for hair removal are typically around 810 nanometers. This near-infrared wavelength comes from the semiconductor diode technology and provides a practical balance between absorption by hair pigment and penetration depth to reach the hair follicle. At this wavelength, enough energy reaches the follicle to heat and damage it while keeping epidermal damage manageable with proper settings. Other common laser wavelengths correspond to different laser types (for example, 755 nm for alexandrite and 1064 nm for Nd:YAG), so 810 nm is the standard wavelength most closely associated with diode devices. A wavelength around 900 nm isn’t a standard diode hair removal setting.