In this study the absorption coefficient of water at different temperatures was investigated for wavelengths at 1920 nm and 1940 nm respectively. The laser radiation was transmitted via a quartz fibre (Ø 600 µm core) into a thermal isolated and heated water filled cuvette. At different temperatures the transmittance of water was measured for both wavelengths. According to Beer-Lambert’s law the absorption coefficient α was calculated.
Absorption coefficient α of water for 1940 nm decreases from 129.2±1.7 /cm2 @ 20 °C to 118.7±1.9 /cm2 @ 80 °C, while for 1920 nm α increases from 126.4±1.6 /cm2 @ 20 °C to 142.5±1.6 /cm2 @ 80 °C. For 35 °C the water absorption coefficient is 127.3±1.6 /cm2 for 1940 nm and 132.5±1.9 /cm2 for 1920 nm.
For both wavelengths in vivo investigations for ablation efficiency are planned to answer the question, if these differences are significant for laser surgery.
- fibre laser
- water absorption
- laser surgery
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Theisen-Kunde, D., Danicke, V., Wendt, M., Brinkmann, R. (2009). Temperature dependence of water absorption for wavelengths at 1920 nm and 1940 nm. In: Vander Sloten, J., Verdonck, P., Nyssen, M., Haueisen, J. (eds) 4th European Conference of the International Federation for Medical and Biological Engineering. IFMBE Proceedings, vol 22. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89208-3_533
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