Working Theory
Three wavelength diode laser equipment is the newest technology with three laser wavelengths - Alexandrite 755nm, Diode 808nm and YAG 1064nm.

808nm: Standard wavelength for all hair types, the 808nm laser has deep penetrating ability, and with moderate melanin absorption ability, it is safe to treat dark skin.
755nm: Specific effective for blonde hair, fine hair, Alex 755nm laser offers energy absorption that allows it to treat the widest variety of hair types, light-colored hair with surface penetration ability.
1064nm: Specific effective for dark and tanned skin, 1064nm laser focused to treat darker skin, can treat hair deeper into the skin.

Handpiece of Diode laser: 

Machine Display: 

Before and After: