Temperature dependence of light absorption in water at holmium and thulium laser wavelengths

Björn I. Lange, Tobias Brendel, Gereon Hüttmann

47 Citations (Scopus)


A simple experimental setup is described that facilitates accurate measurements of the temperaturedependent water absorption coefficient in the mid-infrared spectral region. With this setup, the absorption of holmium and thulium laser radiation in water was quantified to a precision of 0.5%. In the 20–100 °C temperature range, a linear decrease of the absorption coefficient with temperature is observed. The slope coefficients amount to -0.104 ± 0.001 and -0.259 ± 0.003 1/(K cm) for 2090-nm holmium and 2014-nm thulium radiation, respectively. At both wavelengths, this bleaching reduces the absorption coefficients of water at 100 °C by one third when compared with room temperature. A numerical simulation shows that the variable absorption has a noticeable influence on peak temperatures in laser heating of water.

Original languageEnglish
JournalApplied Optics
Issue number27
Pages (from-to)5797-5803
Number of pages7
Publication statusPublished - 10.09.2002

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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