Optical absorption and emission properties of Nd~(3+)doped fluorophosphates glass for broadband fiber amplifier applications

摘要

A new series of fluorophosphates glass is developed which can be doped with an extremely high concentration of Nd~(3+). The dopant concentration dependence of optical absorption and emission properties is reported here for the concentration range of 2.5x10~(20)to 1.25x10~(21) (ions/cm~3). Absorption and emission measurements are performed in order to evaluate the spontaneous emission probability, absorption cross-section, emission cross-section, and laser performance parameters. The stimulated emission cross section for the ~4F_(3/2)→~4I_(13/2) transition increases from 1.14 to 1.64 (x10~4 cm~2) and for the ~4F_(3/2)→~4I_(11/2) transition from 3.68 to 6.68 (x10~4 cm~2) in the MBBA/NdI and the MBBA/NdII, respectively. The extraction efficiency was recorded in the range of 1.91 - 2.73 for ~4F_(3/2)→~4I_(13/2) and of 6.18 - 9.41 for ~4F_(3/2)→~4I_(11/2) for the MBBA/NdI and the MBBA/NdII, respectively. The new (Mg, Ba)F_2-based fluorophosphates glass (MBBA system) is promising for broadband compact optical fiber and waveguide amplifier applications.