Photocaloric spectroscopy of the excited state absorption and of the fluorescence quantum efficiency in fluorescent material |
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| Affiliation: | 1. Health Promotion Research, Copenhagen University Hospital, Steno Diabetes Center Copenhagen, Herlev, Denmark;2. Department of Food and Resource Economics, University of Copenhagen, Frederiksberg, Denmark;3. Clinical Research, Copenhagen University Hospital, Steno Diabetes Center Copenhagen, Herlev, Denmark;4. Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark;5. School of Psychology, University of Leeds, Leeds, United Kingdom |
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| Abstract: | A compensation photocalorimetric technique is described to determine the excited state absorption cross section σ2 of fluorescent materials at the pump wavelength and also their fluorescence quantum efficiency QF. Excitation with a continuous, moderate power laser suffices. σ2 is inferred from the pump intensity dependence of the heat conversion efficiency which is analyzed for materials without fluorescence upconversion. The σ2 obtained is most useful as a calibration point for pump-and-probe excited state absorption measurement, for example, for an analysis of the optical pumping efficiency of laser materials. The technique is successfully tested with the well-characterized ruby (Al2O3:Cr3+) up to high excited state population densities. |
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