Optical saturation in the photothermal spectroscopy of fluorescent materials |
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| Authors: | S B Peralta A Mandelis |
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| Institution: | (1) Photoacoustic and Photothermal Sciences Laboratory, Department of Mechanical Engineering, University of Toronto, M5S 1A4 Toronto, Ontario, Canada;(2) Ontario Laser and Lightwave Centre, M5S 1A4 Toronto, Ontario, Canada |
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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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| Keywords: | 61 80 78 50 |
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