D&PS

Daily Issue (SEP 17. 2021)

LASER in Clinical Medicine
#18-5. Picosecond Laser

As a high-intensity laser beam is irradiated to the tissue and the photons are absorbed into melanin, melanin that absorbed the photons begin to emit electrons, causing a flood of free electrons. The rapid increase in free electrons enhances the electron plasma density, forming hot plasma balls and diffusing the heat into the surrounding tissue to form vacuoles within the tissue (see Figure 5).
Whether the plasma is formed in the dermis or the epidermis can determine the effects of tissue regeneration. Thus, the operator has to consider where to form the plasma to improve treatment of the legion more accurately. In normal laser therapies, the higher the fluence, the deeper the penetration into the tissue. However, the opposite is true in case of a picosecond fractional laser, owing to the plasma shield effect……

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