« Back to Treatment of Skin Disorders

Lasers in Dermatology

»What does the term “laser” stand for?
»What does “stimulated emission of radiation” mean?
»How is the light amplified in the laser system?
»What types of medium are used in laser systems?
»What are the special features of laser light?
»Why is monochromatic light useful?
»What is selective photothermolysis?
»What is an ablative laser?
»What is a nonablative laser?
»What is Q-switching?
»What is a fractional laser?
»How are the types of dermatologic lasers classified?
»What lasers have historic interest but are seldom used?
»What are the basic features of the carbon dioxide (CO2) laser?
»What are some uses for the standard carbon dioxide laser?
»How is the CO2 laser used for resurfacing?
»What precautions must be used with the CO2 laser?
»What are the basic features of the erbium:YAG laser?
»What are pulsed dye lasers?
»What is the flashlamp pulsed dye vascular lesion laser used to treat?
»What is nonablative resurfacing and how does a pulsed dye laser accomplish this?
»What are the disadvantages of the pulsed dye laser?
»What is an Nd:YAG laser?
»How are the long-pulsed Nd:YAG (1064-nm) lasers used?
»How are the long-pulsed KTP lasers used?
»How are the Q-switched Nd:YAG lasers used?
»What is the alexandrite laser?
»How are the alexandrite lasers used?
»What is the ruby laser?
»How are the ruby lasers used?
»What is a diode laser?
»How are the diode lasers used?
»What are nonablative fractional lasers, and for what are they used?
»What are ablative fractional lasers, and how are they used?
»What is an intense pulse light machine?
»What are IPL machines used to treat?
»Are there any risks for IPL use?
»What is radiofrequency resurfacing?
»Are there any risks with radiofrequency treatments?
»What new technologies will soon be available?

 
 
 

How are the alexandrite lasers used?

The Q-switched alexandrite laser is effective in removing green and black tattoo pigment. This laser has also been used to remove brown macules. The long-pulsed alexandrite laser is the gold standard for laser hair removal.

Dark hair in Fitzpatrick types I to IV skin is very effectively removed. The long-pulsed laser has been reported to effectively remove leg veins that are 1 to 2 mm in diameter and blue in color. This laser has recently also been reported to effectively treat brown lentigines on the face and hands (Table 54-7).

Alster TS: Q-switched alexandrite laser treatment (755 nm) of professional and amateur tattoos, J Am Acad Dermatol 33:69–73, 1995.

Ash K, Lord J, McDaniel DH, et al: Hair removal using a long-pulsed alexandrite laser, Dermatol Clin 17:387–399, 1999.
Table 54-7. Alexandrite Lasers
 LASERMODEUSES
 
755 nm
 
Q-switched
 
Tattoos (green, black)
Brown spots
 
755 nm
 
Long-pulsed
 
Hair removal
Leg veins (1–2 mm blue)
Brown spots