Er: YAG laser

Er: YAG laser

Er: YAG laser is a brand-new sort of laser in the 1980s. When the doping concentration is high, the laser can get a result of 2.94 μm. Because the laser has a wavelength of 2.94 um, right at the absorption top of water, it can be highly absorbed by water particles. The mass portion of water in organic cells and tissues is usually greater than 70 per cent.

Consequently, a 2.94 μm laser is an excellent selection for laser biology applications. Utilizing this band of laser can additionally avoid the destruction of other molecular bonds in the cell and does not have big thermal damage like CO2 laser; Additionally, the passing through deepness of erbium laser in organic cells is really superficial, and also its mechanical as well as thermal damages to the body is really small. Therefore, the application as well as development of Er: YAG laser have actually been paid much interest in clinical circles in your home as well as abroad in recent times.

Er: YAG crystal

The laser system of Er: YAG is fairly complicated yet can understand under specific conditions because of various energy transfers.

2.94 μm laser outcome. Its macro features are tiny one-way gain, high threshold, and also difficult to accomplish continual result; Nevertheless, as a result of the high doping focus, it is not easy to generate saturation to ensure that it can acquire the laser pulse with huge power.

Er3+: YAG crystal belongs to the cubic crystal system, an appealing strong laser product in the mid-infrared band, which can output laser of three wavelengths at room temperature level: 1.64 μm, 1.78 μm as well as 2.94 μm, amongst which 1.64 μm as well as 1.78 μm remain in the secure band of human eyes, 2.94 μm is in the hydroxyl absorption height and also can be highly absorbed by biological tissues, so it has an excellent application possibility in laser medicine, laser communication, laser distance dimension, etc application


The output wavelength of Er: YAG laser is 2.94 μm, which is precisely constant with the top of the water absorption spectrum, as well as the absorption coefficient is 13000cm-1, which is the highest among existing clinical lasers. It is a type of laser quickly taken in by water molecules and can accomplish a fantastic result with tiny energy. The optical penetration deepness representing the absorption coefficient is 1μm; compared to various other clinical lasers, the penetration depth is really shallow. This benefit is matchless to other wavelengths and also can be utilized to perform exact cutting and also soft cells excision surgical treatment. Therefore, it appropriates for precision clinical areas such as ophthalmology and capillary.


Er: YAG laser in plastic surgery, bone and tooth cutting and also other applications have brought in much interest.

Furthermore, Er: YAG laser is an extremely risk-free and sensible laser resource for medical use due to the fact that the damages to water-bearing tissue is mechanical damage brought on by water dissipation, which does not leave melt marks, neither does it have the potential risk of genetics mutation caused by damages to cell DNA similar to the excimer laser.

In the last few years, the application of erbium-doped YAG laser in the medical area has been paid more and more focus. With the maturity of Q-switching innovation, the difficulty of Q-switching of Er: YAG laser has relapsed, as well as the regulated 2.94 μm Er: YAG laser, the pulse size is considerably shortened, the peak power is additionally increased, which even more decreases the mechanical damage to the irradiated object surface area, as well as the thermal damage is virtually zero. The edge of the pulse trauma factor is smooth, which is very suitable for numerous accuracy medical fields.


Amongst all kinds of wavelength lasers, Er: YAG laser in the mid-infrared band has a wavelength of 2940nm, which occurs to be near the height of the water absorption curve as well as the second peak of the hydroxyapatite absorption contour. It is easy to be taken in by water as well as hydroxyapatite, as well as particularly easy to be absorbed by water to create high power. As a result, it can act upon soft and tough cells with various water materials to produce cutting, ablating and also grinding effects and also kill all type of germs in the tissues at the same time. Therefore, it is a multi-functional laser extensively utilized in numerous professional subspecialties of the oral cavity.

Furthermore, Er: YAG laser has the shallowest tissue infiltration deepness, only 2μm in soft tissue, 5μm in enamel and 7μm in dentin, which has the advantages of specific therapy and also marginal tissue damages in clinical application. At the same time, the water air conditioning design makes the temperature increase triggered by Er: YAG laser irradiation of soft and tough cells surface no greater than 5 ℃, almost no thermal damage, so the cells reaction after therapy is minor, rapid recovery, really ideal for oral minimally invasive treatment.


The 2.94 μm laser emphasis connects with water-saturated organic tissue. It is equivalent to rapid heating of a limited quantity in which the stress rises and product (such as blood) drains of the laceration without thickening, a fancy some surgical procedures. However it was this quality that brought about the advancement of the laser blood sampler. The effect is good. The pain is smaller than in acupuncture blood collection. The wound location is smaller, the healing is quickly, no infection.