Comparison of Alexandrite and Diode Lasers for Hair Removal in Dark and Medium Skin: Which is Better?

Abstract Introduction: 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 ۷۵۵ nm alexandrite and ۸۱۰ nm diode lasers.Methods: The structure of the skin was created using a realistic skin model by the Advanced Systems Analysis Program.Result: In this study, the alexandrite laser (۷۵۵ nm) and diode laser (۸۱۰ 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 ۴% more than that of the alexandrite laser for the same skin type. For the diode laser at skin depth z = ۰.۶۷ mm, the average transmission ratios of both samples were ۳۶% and ۲۷.۵%, but those for the alexandrite laser at the same skin depth were ۳۲% and ۲۵%.Conclusion: 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. Keywords: lasers simulation skin diode laser