Abstract
Laser photoacoustic spectroscopy measurements were made on Nd3 + ions in garnet, vanadate, and pentaphosphate host crystals. The variations of signal intensities with chopping frequency of the incident light are not in agreement with the predictions of standard photoacoustic signal generation theory. The results are distinctly different for concentrated and dilute Nd-doped crystals, indicating that the mechanisms for generating heat have different characteristics in these two types of samples. The determination of radiative quantum efficiencies of these materials by photoacoustic spectroscopy techniques is also described. These results are compared with those obtained by other methods.
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