Qiong Song

Application of Stereology on Neodymium-Doped Yttrium Aluminum Garnet (Nd:YAG) Transparent Ceramics

Abstract Nd:YAG precursor powders were synthesized by homogeneous precipitation, and Nd:YAG transparent ceramics were prepared by vacuum sintering at 1700 °C for 5 h. The ceramic materials were characterized by light transmittance and field emission gun-environment scanning microscope. Using statistics and stereology theory, study was carried out on the quantitative relationships between light transmittance and stereological parameters in three-dimensional Euclidean space. It is found that the transmittance of Nd:YAG with 1 mm in thickness is about 45% and 58% in visible and near-infrared wavelength, respectively. The transmittance linearly increases with increasing equivalent sphere diameter and reaches the theoretical value of single crystal when the equivalent sphere diameter is 20 μm. The transmittance decreases with the increasing of mean specific area per unit volume of grain and discrete grains, and the transmittance decreases with increasing mean free distance of grains in Nd:YAG ceramics.

Preparation and optical properties of Er3+: Na2O-Al2O3-SiO2 transparent glass-ceramics

Na2O-Al2O3-SiO2 glass-ceramics doped with Er3+ ions were synthesized by the conventional melt quenching technique at a low melting temperature. The samples were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis-NIR scanning spectrophotometry, and fluorescence spectrometry. The results show that the main crystalline phase of glass-ceramics is nepheline.The best heat-treatment process is at 520 °C for 2 h. Because the up-conversion luminescence and near infrared luminescence properties of glass doped with Eu3+ are studied in detail.

Study on the optical spectra of Nd:YAG ceramics

This document shows the desired format and appearance of a manuscript prepared for the Proceedings of the ICO20. It contains general formatting instructions and hints about how to use it. The (Y0.99Nd0.01)3Al5 O12 nano-sized powders were synthesized by low temperature combustion (LCS), using Nd2O3, Y2O3, Al(NO3) 3♦9H2O, ammonia water and citric acid as starting materials. This method effectively solves the problems caused by solid-state reaction at high temperature and hard agglomerates brought by chemical precipitation method. The powders were characterized by TG-DTA, XRD, TEM respectively. The study focused on the photoluminescence (PL) spectra of (Y0.99Nd0.01)3Al5 O12 ceramic green and sintered disks. The experiments show that the forming temperature of YAG crystal phase is 850°C and YAP crystal phase appearing during the calcinations transforms to pure YAG at 1050°C. The particle size of the powders synthesized by the LCS is in range 20-50nm depending on the thermal treatment. The effectively induced cross section (σin) with the value 4.03×10-19cm2 of (Y0.99Nd0.01)3Al5 O12 ceramics is about 44% higher than that of single crystal.