Optical saturation effects in photothermal spectroscopy
Abstract
The dependence of the fundamental and harmonic photothermal (PT) signals on the intensity I0 of the illumination source is analyzed. It is found that the PT signal does not indefinitely increase with I0, but at sufficiently high power densities begins to decrease as 1/I0. The onset of optical saturation thus defines an upper limit to the sensitivity of spectrometers based on photothermal detection.
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