The alexandrite laser emits red light at a wavelength of 755 nm. Not surprisingly, the clinical uses of the alexandrite laser are similar, if not identical to the ruby laser [18-21].
23.1.1.1 Diode
The diode laser used in dermatology emits infrared light at 810 nm. The lasing medium is a semiconductor comprised of gallium-aluminum-arsenide. The depth of penetration of 810 nm diode light is greater than ruby or alexandrite lasers, whereas its energy and melanin absorption is slightly lower, resulting in fewer dermal side effects, compared to the ruby and alexandrite. The diode laser is primarily used for hair removal [22], although its use in the treatment of leg veins has also been reported [23]. Presently, in some countries there is a commercially available hand-held diode laser device intended for hair removal [23].