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Abstract
Spectral Dependence of Laser Light on Light tissue Interactions and its Influence on Laser Therapy: An Experimental Study
Marshall RP and Vlková K
This paper aimed to summarize available facts about the spectral influence on
reflection, refraction and absorption and to measure relative absorption of
different wavelengths. The experiment showed that longer wavelengths lead to
decreasing energy absorption and refraction index in the melanin, as well as a
reduction of hemoglobin energy absorption. Longer wavelengths increase the
probability of the interaction with water particles and its own light absorption. We
conclude that reflection and melanin absorption are negligible for wavelengths
higher than 1000 nm due to the ability to penetrate higher amounts of energy into
the tissue. Additionally, water absorption increases with the longer wavelengths
and refraction index and hemoglobin absorption are reduced.
