Effect of long- and short-term exposure to laser light at 1070 nm on growth of Saccharomyces cerevisiae

Thomas Aabo, Ivan R. Perch-Nielsen, Jeppe Seidelin Dam, Darwin Palima, Henrik Siegumfeldt, Jesper Glückstad, Nils Arneborg

Research output: Contribution to journalJournal articleResearchpeer-review


The effect of a 1070-nm continuous and pulsed wave ytterbium fiber laser on the growth of Saccharomyces cerevisiae single cells is investigated over a time span of 4 to 5 h. The cells are subjected to optical traps consisting of two counterpropagating plane wave beams with a uniform flux along the x, y axis. Even at the lowest continuous power investigated—i.e., 0.7 mW—the growth of cerevisiae ell clusters is markedly inhibited. The minimum power equired to successfully trap single S. cerevisiae cells in three dimensions is estimated to be 3.5 mW. No threshold power for the photodamage, but instead a continuous response to the increased accumulated dose is found in the regime investigated from 0.7 to 2.6 mW. Furthermore, by keeping the delivered dose constant and varying the exposure time and power—i.e. pulsing—we find that the growth of S. cerevisiae cells is increasingly inhibited with increasing power. These results indicate that growth of S. cerevisiae is dependent on both the power as well as the accumulated dose at 1070 nm.
Original languageEnglish
JournalJournal of Biomedical Optics
Issue number4
Pages (from-to)041505
Publication statusPublished - 2010


  • cells
  • infrared lasers
  • laser-induced damage

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