Abstract

A piezoelectric detection system for recording photoacoustic (PA) spectra of materials in the condensed phase was designed and fabricated. A Nd–YAG laser pumped tunable dye laser with a bandwidth of 0.05 nm was used for recording the fine structure of bands in the region between 610–680 nm in powdered microcrystalline samples of Ho₂O₃ and Nd₂O₃. Analysis of high resolution photoacoustic spectra obtained new information on the Stark components of the ground and excited states of Ho³⁺ and Nd³⁺ in the oxide matrix.

© 1990 Optical Society of America

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