The Wavelenght 0.97 µm coincides with the local maximum of absorption in water and oxyhemoglobin, which are the main contents of soft tissue. Due to this laser light with such wavelenth is absorbed in the ~2mm layers of the soft bio-tissue.The risk of damage with the laser light of deeper laying organs is lower. The cutting effect is about 2 to 3 times more powerful than lasers with wavelength of 0.8 µm or 1.064 µm.

At the same time the laser light of 0.97 µm has good coagulation effect. Furthermore effects are practically independent of tissue type. Hence 0.97 µm laser diodes are suitable for most applications. The radiation at 1.56 µm(A fiber laser based on a fiber activated by Er ions) is weakly absorbed in hemoglobin and melanin, wheras its absorption in water is significant. Therefore it can be used in laser thermoplastics of cartilages, like in the correction of nasal septum shape, when the cartilage should be heated at a minimal action on the blood-containing tissues. Using lasers at a wavelenght of 1.56 µm, positive results on the regeneration of cartilagenous tissues of intervertebral disks have been obtained. Moreover this wavelength can be efficient in the nonsurgical correction of defects of eyesights.