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-- Excimer laser light is typically absorbed within under a millionth of a meter (nanometer) of tissue. * * *a millionth of a meter is a micrometer, a billionth of a meter is a nanometer. Which one is it?* * *-->In 1980–1983, Rangaswamy Srinivasan, Samuel Blum and James Wynne at IBM’s T. J. Watson Research Center observed the effect of the ultraviolet excimer laser on biological materials.