Phase transition and frequency doubling of β-BaB2O4 and K3Li12-xNb5+xOb15+2xcrystals

High temperature phase transition of (beta) -BaB2O4 (BBO) and K3Li12-xNb5+xO15+2x (KLN) crystals are studied in detail by using high temperature Raman scattering. The temperature increasing of the crystals due to the increasing of the incident laser power during the frequency doubling process and the influence on the structure of the crystals are analyzed. It is the first time that the relationship between the phase transition and the frequency doubling is studied by high temperature Raman spectra. The opinion of phase transition having effect on frequency doubling is given out.