1991/01/01 by Shibin Jiang, Jiang, Shibin, Jiang, Yasi
Engineering · Materials Science · #660 #Glass properties and applications #Laser Material Processing Techniques #Luminescence Properties of Advanced Materials
paper · doi:10.34657/14104
openalex publication_date 1991/01/01 · openalex created_date 2016/09/30 · openalex updated_date 2026/07/01
Laser glasses of the system R<sub>2</sub>O(MO)-P<sub>2</sub>O<sub>5</sub>-B<sub>2</sub>O<sub>23/sub>-Ln<sub>2</sub>O<sub>3</sub>(R = Li, Na, K; M = Ca, Sr, Ba; Ln<sub>2</sub>O<sub>3</sub> = La<sub>2</sub>O<sub>3</sub> + Nd<sub>2</sub>O<sub>3</sub>) at high Nd<sup>3+</sup> concentrations of 1 ∙ 10<sup>21</sup> ions/cm<sup>3</sup> were prepared. By using reactive atmosphere processing to remove hydroxyl groups, the infrared absorption coefficient at 3.5 μm due to OH- groups was below 1 cm<sup>-1</sup>. Absorption and fluorescence spectra, fluorescence lifetimes and thermal expansion coefficients were measured, and the stimulated emission cross-section for the <sup>4</sup>I<sub>11/2</sub> transition and the quantum efficiency were calculated. The results indicate that the borophosphate glass is possessed of a large stimulated emission cross-section, especially for alkali oxide containing borophosphate glass systems in which the stimulated emission cross-section is larger than 4.4 ∙ 10<sup>-20</sup> cm<sup>2</sup>, and the effect of alkali and alkaline earth ions depends on the bonding strength between the cation and oxygen. The influence of B<sub>2</sub>O<sub>3</sub> in borophosphate glasses on the fluorescence lifetime is much less than that in silicate glasses, and the quantum efficiency of borophosphate glasses, different from borate and borosilicate glasses, is high. The introduction of B<sub>2</sub>O<sub>3</sub> strengthens the structure resulting in a lower thermal expansion coefficient and an excellent thermal shock resistance.</sub>