Infrared lasers for medical applications were summarized in this review. CO2 laser is the first infrared medicallaser. Use of conventional medical lasers depends on absorption coefficient of water. Nd: YAG laser is used incoagulation surgery. Ho: YAG laser is used to cut or vaporize tissue. Er: YAG laser is used in caries therapybecause of its large absorption coefficient of water. Pulse lasers are used because less than 1 μsec pulse lasersinduce less thermal effect than CW lasers. The medical applications of FELs have merits of wavelengthselectivity and psec-nsec pulse structure. When the wavelength can be tuned to the vibrational mode, theinfrared lasers will be widely used on biomedical field in the near future because the lasers can activate bindingsbetween bio-molecules directly.
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Kunio Awazu (2000) studied this question.
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