Clarification on Laser Dye Concentrations

August 2002 page 77

In Physics Update for the February 2002 issue of Physics Today ( page 9), one item states, "In most dye lasers, the dye concentration cannot go above a millimole/liter without quenching the fluorescence." Subsequently, lasing at a concentration of 9 mmol/L is highlighted as an achievement by the authors.¹ It should be noted that dye concentrations of several mmol/L, sometimes up to 10 mmol/L, have been known for a long time in the field of laser-pumped dye lasers.²

References

1. S. Yokoyama, A. Otomo, S. Mashiko, Appl. Phys. Lett. 80, 7 (2002).

2. See, for example, C. H. Chen, J. L. Fox, F. J. Duarte, J. J. Ehrlich, Appl. Opt. 27, 443 (1988).

F. J. Duarte

(fjduarte@opticsjournal.com)

Rochester, New York

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Clarification on Laser Dye Concentrations

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