title: Comparison of Alexandrite and Diode Lasers for Hair Removal in Dark and Medium Skin: Which is Better?
abstract: BACKGROUND
  To improve laser hair removal (LHR) for dark skin, the fluence rate reaching the hair follicle in LHR is important. This paper presents the results of a comparative study examining the function of wavelength on dark skin types using 755 nm alexandrite and 810 nm diode lasers.
  
  
  METHODS
  The structure of the skin was created using a realistic skin model by the Advanced Systems Analysis Program.
  
  
  RESULTS
  In this study, the alexandrite laser (755 nm) and diode laser (810 nm) beam-skin tissue interactions were simulated. The simulation results for both lasers differed. The transmission ratio of the diode laser to the dark skin dermis was approximately 4% more than that of the alexandrite laser for the same skin type. For the diode laser at skin depth z = 0.67 mm, the average transmission ratios of both samples were 36% and 27.5%, but those for the alexandrite laser at the same skin depth were 32% and 25%.
  
  
  CONCLUSIONS
  Both lasers were suitable in LHR for dark skin types, but the diode laser was better than the alexandrite laser because the former could penetrate deeper into the dermis layer.
authors: Medical Physics and Radiation Science, College of Pharmacy, Hawler Medical University, 44002 Erbil, Iraq.
authors: Farhad Hamad
authors: FH
authors: Mustafa
authors: Medical Physics and Laser Research Group, School of Physics, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Mohamad Suhimi
authors: MS
authors: Jaafar
authors: Radiation Science and Medical Physics, Education College, Physics Department, Salahaddin University, 44002 Erbil, Iraq.
authors: Asaad Hamid
authors: AH
authors: Ismail
authors: Engineering Physics, School of Physics, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Kussay Nugamesh
authors: KN
authors: Mutter
keywords: diode laser; lasers; simulation; skin
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