The infrared transmission spectra of KTiOPO4 (KTP) have been closely inspected in the region between 4000 and 1000 cm−1 (2.5–10 μm) using single-crystal samples of various thicknesses. The spectral information obtained reveals that the band edge at 4.5 μm is due to the first overtone of the ν3 tetrahedral phosphate fundamental vibration. A heretofore questionable absorption centered at 3.3 μm has been shown to be the second overtone of this same fundamental vibration.
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Jacco et al. (1991) studied this question.
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