Abstract

KTP single crystals exhibit some spectral features due to absorption in the far infrared between 4000 cm⁻¹ and 2200 cm⁻¹. Although this region has been investigated under low¹ and high resolutions^2–3 with both hydrothermally and flux-grown KTP crystals, not all the bands have been identified. By comparing the spectra of KTP crystals hydrothermally grown with ordinary water with that of D₂O-grown KTP, we identify those features that are related uniquely to the presence of H₂O or D₂O during growth process, and those features that are not. The most prominent OH⁻ peak in ordinary water KTP appears around 3566 cm⁻¹. In heavy water KTP this peak is shifted to 2604 c m⁻¹ due to the H-isotope effect.

© 1986 Optical Society of America