New chemically stable Er~(3+)-Yb~(3+) co-doped phosphate glass for optical waveguide lasers and amplifiers

摘要

A set of phosphate glasses with different amounts of Al_2O_3, Na_2O, La_2O_3 and AlF_3 contents were prepared to search for a phosphate glass which is suitable for ion-exchange process. Based on chemical durability test results and spectroscopic properties, a glass with excellent chemical durability and good spectroscopic properties is developed for ion-exchange process. The emission cross section of Er~(3+) in this glass is calculated to be 0.72 x 10~(-20) cm~2 by McCumber theory. The planar waveguide with three modes at 632.8 nm and one mode at 1540 nm can be realized by 335℃ 3 hours ion-exchange in 5%AgNO_3+95%KNO_3 molten salt.