In our previous study, we found that femtosecond pulsed laser can inactivate bacteria more effectively than continuous wave light with UV-C irradiation. We hypothesized that the mechanism of enhanced bacterial inactivation by femtosecond pulsed laser is caused by a nonlinear optical effect due to the high peak intensity. In this experiment, we performed an experiment to compare the bacterial inactivation as the irradiation intensity was varied. This comparative experiment revealed, in the case of UV-C irradiation, that bacterial inactivation effect was the same regardless of the peak intensity and a nonlinear effect of bacterial inactivation does not be confirmed.
We compared the bacterial inactivating effect of continuous light and pulsed light irradiation to develop a novel technology for safety transfusion. This experiment demonstrated that pulsed light achieved higher inactivation than continuous light.
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