Ronald A. Malt, M.D.
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Coherent visible light from an optical maser (laser) can be focused through a conventional optical system to a spot approaching ⅓ µ in diameter. This enormous concentration produces a power density greater than that of radiant energy at the surface of the sun; yet, minute targets subjected to the flux can be heated with no effect on thermal equilibrium in surrounding tissue.
Actual effects on a biological object depend on the absorbent properties at a given wavelength as well as the intensity of incident radiation. Since pigmented areas are affected far more than reflective or transparent ones, focal lesions can
Malt RA. Microsurgery and Spectroscopy with the Maser.. Ann Intern Med. 1964;60:726–727. doi: https://doi.org/10.7326/0003-4819-60-4-726_2
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Published: Ann Intern Med. 1964;60(4):726-727.
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