Er:YAG laser is a solid pulse laser with a wavelength of 2940nm, Its wavelength is right at the highest absorption peak of water. Its absorption efficiency is 200 times of 2.1um Ho:YAG laser, 10,000 times of the 1.06um Nd:YAG laser. Based on this feature, it can be used for precise cutting and soft tissue ablation, with less thermal diffusion and mechanical damage to adjacent tissues. When the krypton laser pulse acts on the skin, the energy is quickly absorbed by the tissue, causing rapid warming of the superficial skin, resulting in instantaneous vaporization separation and precision exfoliation of the tissue. Because of its achievable and precise cutting, Er:YAG laser can be used for medical Laser microtherapy, such as skin medicine, dentistry, cardiology, ophthalmology, etc.
Theotry
2940nm Laser Crystal - Er:YAG
| Laser Wavelength | 2940 nm (highly doped); 1645 nm (low doped) |
| Photon Energy | 6.75×10-20J@2940nm |
| Pump Absorption Band Width | 600~800 nm (highly doped); 1530 nm (low doped) |
| Damage Threshold | >500MW/cm2 |
| Emission Cross Section | 3×10-20 cm2 |
Q-Switch：LiNbO3 crystal
We use LiNbO3 crystal as Q-switch， Because LiNbO3 has a high transmittance to light with wavelength of 2940nm. Both ends of LiNbO3 crystal are cutting against Brewster’s angle(OB=650).meanwhile, it polarizes lase and is the Q-switch of lase. As a result, we don’t need a independent polarizer any more., The insertion loss in the resonant cavity is reduced.
- More accurate and safe grinding
- Minimal thermal damage
- suitable for both superficial treatment and deep grinding
- The risk of scar formation and pigmentation changes is greatly reduced
- Most treatments do not require anesthesia
- The healing period is short and the side effects are low
- The skin tissue recovered quickly after surgery
The absorption coefficient of erbium laser is 10 times higher than that of CO2. It only acts on the superficial layer of skin, and the depth of erbium laser is 10-100um. It will not cause damage to the surrounding skin and deep tissue. It has high accuracy and safety. 2940nm Er:YAG laser used in following field:
- Erbium laser hydrates and softens the skin
- Erbium laser therapy for the edge scar of the transplanted skin
- Erbium laser wrinkling
- Erbium Laser-Mole-Removal
Er:YAG laser is widely used in oral treatment because of its excellent performance and advantages. It has been used in following field.
- Caries Removal
- Removal of Gingiva Melanin
- Excision of Swelling
- Frenulum lengthening
- Crown Lengthening
