The most important application area of Alexandrite lasers is dermatology. For example, such lasers are used for hair removal, for removing tattoos and for treating visible leg veins and pigmented lesions. In the case of hair removal, the light from a long-pulse laser is preferentially absorbed at the hair shafts, and the resulting heat damages these hair shafts and the surrounding hair follicles (selective photothermolysis). By cooling the skin during the treatment, damage to the epidermis is minimized. The short emission wavelength of an Alexandrite laser, compared with that of a Nd:YAG laser, is beneficial for removing finer hairs, but increases the risk of skin damage in case of darker skin. (The absorption occurs mostly in melanin, which occurs in hair but also in dark skin, and less in hemoglobin.)
Alexandrite Laser Crystal repair
The most common types of coatings are anti-reflection (AR) and high-reflective (mirror) coatings for 755nm lasers Alexandrite laser crystals. The optical coating is generally the limiting factor in the performance ability of a high-power laser system. Regardless of the type of damage, coating failure irrevocably and adversely affects the transmitted wavefront. This can have a drastic effect on system performance, but can also be costly when the time comes to replace the damaged Alexandrite laser crystal. It is important that the laser technician identify the damaged Alexandrite crystal and replace them with new rod to ensure that the machine is at optimal performance. We recommend that the user purchase back up Alexandrite crystal rod so that they can send the damaged one for repair during servicing and replacement.
The turnaround time for Alexandrite crystal repair is about 30 working days. Each year, we recoat hundreds of Alexandrite laser rods and YAG laser rod assemblies to like-new condition. Reparing the Alexandrite laser rods can reduce operating cost and ensure machine is always working at optimum condition.