Spectroscopic properties of Nd3+:CaNb2O6 crystal

Abstract

The absorption spectra, fluorescence spectrum and fluorescence decay curve of Nd3+ ions in CaNb2O6 crystal were measured at room temperature. The peak absorption cross section was calculated to be 6.202×10−20 cm2 with a broad FWHM of 7 nm at 808 nm for E//a light polarization. The spectroscopic parameters of Nd3+ ions in CaNb2O6 crystal have been investigated based on Judd-Ofelt theory. The parameters of the line strengths Ω t are Ω 2=5.321×10−20 cm2,Ω 4=1.734×10−20 cm2,Ω 6=2.889×10−20 cm2. The radiative lifetime, the fluorescence lifetime and the quantum efficiency are 167 μs, 152 μs and 91%, respectively. The fluorescence branch ratios are calculated to be β 1=36.03%,β 2=52.29%,β 3=11.15%,β 4=0.533%. The emission cross section at 1062 nm is 9.87×10−20 cm2.