The glass null Tm 3+

摘要

The germanate glass composition which is suited for the use of the fiber amplifier for broadband expansion of the light information is offered. As for the glass, desirably, GeO_{2 of the} 35-75%, PbO of the 0-45%, BaO of the 5-20%, ZnO of the 5-20% and R₂ O of the 2-10% (R=Na, Li and K) it includes. The thulium ion (the Tm³⁺) is doped, the holmium ion (the Ho³⁺) is doped also. The glass composition of this invention gives big bandwidth much in comparison with the glass of the time before. In addition, also affinity of the existing silica optical fiber is superior very. Selective figure Figure 2