Abstract
This chapter explains the uses of laser in the field of medicine. An understanding on how the new and traditional sources of laser light interact with human tissue is an essential prerequisite for choosing suitable methods for treatment and diagnostics. The principle of interaction between laser radiation and biological tissue interaction is determined by the laser irradiance, which depends on the pulse energy, pulse duration, and the spectral range of the laser light. The absorption spectra of main absorbers in biological tissue are presented in figure along with a table that provides a comparison of penetration depths in biological tissue for different types of lasers. The photochemical interactions highlight on the aspect of how laser induces chemical effects by initiating chemical reactions in tissue. The interactions that are induced in a tissue by the local temperature of a laser beam are given in the section on thermal interaction. The mechanism of photo ablation, plasma-induced ablation, and application of lasers in medicine are explained with illustrations. References to further resources are provided.
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