At present, laser is an excellent solution for removing pigment from plaque and has been widely used. The mainstream green laser pointer wavelength in the treatment of pigmented lesions is 694nm, 755nm, 808nm, 1064nm, etc., of which 755nm wavelength is a very important application wavelength. The main reason is that the specificity of 755nm wavelength for melanin absorption is the highest among all laser despeckles. The higher the specificity, the more obvious the effect of removing melanin, the higher the clearance rate, the shorter the treatment times, and the skin safety. The higher.
From the absorption peak of melanin, the absorption coefficient at 755 nm is 8-10, and the absorption coefficient at 1064 nm is between 4-5. The absorption rate of melanin decreases with increasing wavelength, and the longer the wavelength, the less melanin absorption. Therefore, the higher the melanin absorption, the more obvious the role of the green laser pointer, and the 755 nm can fully act on the target tissue. The absorption rate of melanin decreases with increasing wavelength, and the longer the wavelength, the less melanin absorption, the higher the onset energy required for treatment. Therefore, in the melanin absorption problem, the 755nm laser uses a lower energy to achieve a significant therapeutic effect, minimizing side effects.
When laser is applied to the skin, melanin and blood absorb energy. When considering the wavelength absorption rate of melanin, we can not ignore the absorption rate of blood, because both blood and melanin can absorb, while melanin There is no comparative advantage. Since blood is not the target we want to deal with, we don't want blood to absorb energy too much, because the better the blood absorbs energy, the more energy it represents, the less efficient it is in dealing with melanin.
Non-target (blood) absorbs energy, in addition to the overall energy output to strengthen to achieve a certain degree of stimulation of melanin, it will also bring unnecessary side effects, such as redness, subcutaneous bleeding, anti-black, etc., prolonging the recovery time It also increases the risk of side effects such as pigmentation, hyperpigmentation and hypopigmentation.
Therefore, the better the absorption ratio of melanin to blood means that the hemoglobin has less competitive absorption and the better the laser effect. The absorption energy ratio of 755 nm melanin to blood is 50 times better, and the ratio of absorption energy of 1064 nm melanin to blood is only 16 times higher. In contrast, the effect of 755 nm is about 3 times better than that of 1064 nm.
So the advantage of the 755nm laser is that it has a higher melanin absorption ratio and less hemoglobin competitive absorption, which means it can achieve results at lower energy levels, greatly reducing the chances of these side effects and shortening recovery. Time reduces the number of treatments required.
Green laser pointer wavelength selection for pigmented skin problems. When the above two conditions are met, there is also a condition that the penetration depth of these wavelengths must reach the dermis layer in order to effectively improve the superficial layer to the deep skin layer. Pigmented lesions.
Although the laser skin penetration depth of 755 nm wavelength is not clearly identified in the above figure, it is easy to see the penetration depth of the wavelength according to the wavelength range and the penetration depth of the different wavelengths in the following figure. The 755 nm wavelength can be effectively worn. Through the dermis layer of the skin, it can achieve a good therapeutic effect on various pigmented lesions from epidermis to dermis.
It is the broad prospect of green laser pointer in the medical beauty market. As one of the few professional suppliers of high-power laser chips in China, Shenzhen Ruibo Optoelectronics Co., Ltd. has been developing medical laser chips since 2014. 755nm laser chip, model RB-755A-350-8-2.5-SE, light bar width 350um, cavity length 2.5mm, working power 8W, photoelectric conversion efficiency 42%, working voltage 1.9V. (According to the single-tube chip test data. In the single-tube chip test, the COS (Chip On Submount) package has a COS test temperature of 25 ° C and a thermal resistance of 2 to 3 K/W.)