Reading Time: <1 minuteToday, we gathered our staff together to explain the absorption curve, which is the most basic of laser principles. If you do not fully understand the absorption curve, you will not understand the meaning of laser treatment. In the body, there are three substances that must be considered when irradiating with a laser: water, red blood cells, and melanin. The principle of laser treatment for dark spots is how to destroy melanin efficiently without damaging other targets. Not only the wavelength but also the absorption rate of other targets must be considered. In addition to this, we consider various laser wavelengths, the depth of penetration, and the target that absorbs it when performing treatment. The longer the wavelength, the deeper the light penetrates, and the shorter the wavelength, the shallower the light penetrates. This is supplemented by doubts about pulse width and energy. ・Wavelength ・Pulse width ・Energy This is an important point for laser treatment. The 10nm Q-switched YAG laser targets melanin in the epidermis. The 6nm Q-switched YAG laser targets pigmented disorders in the dermis (ADM, nevus of Ota, tattoos, nevus spilus, etc.). The Q-switched ruby ​​laser has good absorption properties for melanin. It is sharp when treating age spots, so dermatologists prefer to use it. Recently, pico lasers with extremely short pulse widths have been actively used for tattoo removal and age spot treatment. 20-XNUMX is pico, XNUMX-XNUMX is nano. The Q-switched YAG laser also has a fairly short pulse width of XNUMX-XNUMX billionths of a second, but... Cutting-edge laser equipment is constantly evolving.