Growth of large-sized Nd:NY(WO 4) 2 crystal and its spectral properties

Abstract

This paper reports the growth of Nd 3+:NY(WO 4) 2 crystal with high optical quality and large size. Nd 3+:NY(WO 4) 2 crystal with the dimension Φ30×75 mm 2 and optical homogeneity 4×10 −5 was grown by Czhchoralski method: the seed used was [1 0 0] orientation, the pulling rate and rotating rate were 0.5–1.25 mm/h and 15 rpm, respectively. The growing processes and characteristics of Nd 3+:NY(WO 4) 2 crystal was discussed. Its unpolarized absorption spectra and emission spectra were measured. The absorption cross-section and emission cross-section were presented. Based on the Judd–Ofelt theory, we obtained the three intensity parameters: Ω 2 = 5.8 × 1 0 - 20 , Ω 4 = 5.74 × 1 0 - 20 , and Ω 6 = 4.32 × 1 0 - 20 cm 2 . The radiative probabilities, radiative lifetimes, branch ratios and quantum efficiency of Nd 3+:NY(WO 4) 2 were calculated too.