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Optical saturation in the photothermal spectroscopy of fluorescent materials

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Abstract

The dependence of the fundamental and harmonic photothermal (PT) signal on the intensity I 0 of the illumination source is analyzed. It is shown that both components of the PT signal do not increase indefinitely with I 0, but at sufficiently high power densities begin to decrease as 1/I 0. Along with photoacoustic saturation, this defines an upper limit for the sensitivity of spectrometers based on PT detection.

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Authors and Affiliations

  1. Photoacoustic and Photothermal Sciences Laboratory, Department of Mechanical Engineering, University of Toronto, M5S 1A4, Toronto, Ontario, Canada

    S. B. Peralta & A. Mandelis

  2. Ontario Laser and Lightwave Centre, M5S 1A4, Toronto, Ontario, Canada

    S. B. Peralta & A. Mandelis

Authors
  1. S. B. Peralta
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  2. A. Mandelis
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Peralta, S.B., Mandelis, A. Optical saturation in the photothermal spectroscopy of fluorescent materials. Appl. Phys. A 50, 353–356 (1990). https://doi.org/10.1007/BF00323589

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  • DOI: https://doi.org/10.1007/BF00323589

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