Decay of Raman active vibrations in potassium titanyl phosphate
Document Type
Presentation
Date of Original Version
3-27-2026
Abstract
Potassium titanyl phosphate (KTP) is an inorganic crystalline material with a chemical formal of KTiOPO4 that is a highly transparent solid. It is a technologically important nonlinear optical material that is used for frequency conversion devises such as lasers as a gain medium. Some more applications of KTP are as the lasers used in surgery, laser pointers, electro-optic devices such as waveguides, modulators and switches. The oxide groups in the crystals are TiO6 and PO4 groups and they have unique Raman active vibrations. We have used a three- color Coherent Anti-Stokes Raman scattering (CARS) technique to target and probe these Raman active vibrations and measured the decay times of these vibrations in real time with the ultrafast time resolution (<120 fs). The excellent sensitivity of the experimental system has led to more precise decay time and linewidth measurements (~ 0.1 cm-1). The vibration/phonon decay times were found to be in the range 0.475 -2.15 ps. Corresponding decay rates and linewidths were in the range 0.93-4.25 ps-1 and 4.9 – 22.3 cm-1. Among the nine phonon modes measured 6 belongs to TiO6 group and 3 belongs to PO4 group. We believe that the decay time spread is due to the parametric phonon interactions due to anharmonicity of the lattice potential in the crystal. We believe our findings provide new insights into this technologically important material.
Recommended Citation
Singhapurage, Helani, "Decay of Raman active vibrations in potassium titanyl phosphate" (2026). Oral Presentations. Paper 37.
https://digitalcommons.uri.edu/gradcon2026-presentations/37