In the context of laser application, what does "Selectivity" refer to?

Selectivity in the context of laser applications refers to the ability of a laser to target specific tissues while minimizing damage to surrounding areas. This characteristic is crucial in medical and cosmetic procedures, as it allows for precise treatment of conditions without adversely affecting healthy tissue. For instance, in dermatology, a laser might selectively treat pigmented lesions or vascular structures, effectively addressing the issue while preserving the normal skin.

The other aspects, such as the speed of the laser application, the type of laser used, and the duration of treatment, do not pertain directly to how the laser interacts with different tissues. While they are important factors in the overall effectiveness and efficiency of the treatment, they do not encapsulate the concept of selectivity.