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The demand for cutting-edge disinfection methods has rekindled research on photoinactivation with visible light. This study investigated the bactericidal activity of femtosecond laser irradiation against vancomycin-resistant\n                    <jats:italic>Enterococcus faecalis<\/jats:italic>\n                    V583 (VRE). The effect of parameters such as wavelength and energy density on the viability and growth kinetics of VRE was studied to design an optimized laser-based antimicrobial photoinactivation approach without any prior addition of exogenous photosensitizers. The most effective wavelengths were 430\u00a0nm and 435\u00a0nm at a fluence of 1000\u00a0J\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , causing a nearly 2-log reduction (98.6% and 98.3% inhibition, respectively) in viable bacterial counts. The colony-forming units and growth rate of the laser-treated cultures were progressively decreased as energy density or light dose increased at 445\u00a0nm but reached a limit at 1250\u00a0J\/cm\n                    <jats:sup>2<\/jats:sup>\n                    . At a higher fluence of 2000\u00a0J\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , the efficacy was reduced due to a photobleaching phenomenon. Our results highlight the importance of optimizing laser exposure parameters, such as wavelength and fluence, in bacterial photoinactivation experiments. To our knowledge, this is the first study to report an optimized wavelength for the inactivation of VRE using visible femtosecond laser light.\n                  <\/jats:p>","DOI":"10.1007\/s10103-024-04080-5","type":"journal-article","created":{"date-parts":[[2024,5,29]],"date-time":"2024-05-29T09:01:51Z","timestamp":1716973311000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Studying the viability\u00a0and growth kinetics of vancomycin-resistant Enterococcus faecalis V583 following femtosecond laser irradiation (420\u2013465 nm)"],"prefix":"10.1007","volume":"39","author":[{"given":"Ahmed O.","family":"El-Gendy","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Ezzat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatma Abdel","family":"Samad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ola Ali","family":"Dabbous","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan","family":"Dahm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael R.","family":"Hamblin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1358-2110","authenticated-orcid":false,"given":"Tarek","family":"Mohamed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,29]]},"reference":[{"issue":"1","key":"4080_CR1","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1016\/j.tripleo.2005.06.017","volume":"102","author":"AU Eldeniz","year":"2006","unstructured":"Eldeniz AU et al (2006) Assessment of antibacterial activity of EndoREZ. 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