The wavelength of Ho:YAG laser is 2100nm. The absorption of 2100nm laser by water is about 25 cm-1, which is 25 times more than the absorption of Nd:YAG laser . Therefore, the Ho:YAG laser penetrates soft and hard tissues shallowly, because of high surgical precision and unique coagulation effect that limits the area of damage.The Ho laser can be delivered in a low OH-based quartz fiber, and can work efficiently in both gas and liquid environments.The Ho laser endoscopically treats a variety of intracavitary diseases.
The 2 μ m laser has a strong absorption peak for water, which is the main component of biological tissues, and therefore penetrates biological soft tissues to a depth of only a few hundred microns. The laser spot is extremely directional and extensible, which can ablate small areas and cause transient coagulation of biological proteins, so the cut tissue can be rapidly hemostatic during surgery. These advantages make the 2 μm laser an ideal light source for medical procedures.
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