Laser interactions with cells and tissues play an important role in many areas of biomedical science, providing both the tools to interrogate structure and function of biological systems and the means to affect its properties either through laser surgery or through more gentle effects of low-level laser therapy. While the vast majority of reports can be described using classical light interaction with molecules through absorption and scattering, the quantum nature of light and molecular systems, which are being affected by light, should play a certain role in defining mechanisms of such interactions potentially leading to unusual, non-classical behavior. In this report, I will evaluate our recent results on laser interactions with biological systems at different levels of organization to understand and, possibly, predict quantum behavior of the system upon excitation for coherent laser sources.
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