| 摘要 |
PURPOSE:To provide optical fiber of calcogenide mixed with a rare earth element by improving a composition of a conventional calcogenide, developing glass mixable with the rare earth element. CONSTITUTION:In calcogenide glass comprising S, Se and Te elements as anions, glass contains at least one kind of element from Al, Ga, Tl, In, Sb and Bi and at least one kind of rare earth element and optical fiber comprises the glass as a core. Glass mixed with the rare earth element, comprising calcogenide glass having small lattice vibration energy as a parent material, can be supplied. By using the glass as a core material for optical fiber mixed with the rare earth element, a fiber laser or a fiber amplifier having extremely raised effect of quantum of transition in 4f shell of the rare earth element and high efficiency can be constituted. |
