A rare earth-doped core optical fiber includes a core comprising a silica glass containing at least aluminum and ytterbium, a clad provided around the core and comprising a silica glass having a lower refraction index than that of the core, and a polymer layer provided on the outer circumference of the clad and having a lower refractive index than that of the clad, wherein aluminum and ytterbium are doped into the core such that a loss increase by photodarkening, TPD, satisfies the following inequality (A). By this rare earth-doped core optical fiber, it is possible to manufacture an optical fiber laser capable of maintaining a sufficient laser oscillation output even when used for a long period of time.; TPD≧10{−0.655*(DAl)−4.304*exp{−0.00343*(AYb)}+1.274} (A)
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机译：稀土掺杂芯光纤包括：芯，该芯包括至少包含铝和的石英玻璃;包层，设置在该芯周围，并且包层，该石英玻璃的折射率比芯的折射率低;聚合物层设置在其上包层的外围具有比包层的折射率低的折射率，其中铝和掺杂到纤芯中，使得光暗化引起的损耗增加T PD 满足以下不等式（一种）。通过该稀土掺杂芯光纤，可以制造即使长时间使用也能够维持足够的激光振荡输出的光纤激光器。 <？in-line-formulae description =“在线公式” end =“线索”？> T PD ≧10 {− 0.655 *（D Al ）− 4.304 * exp {-0.00343 * （A Yb ）} + 1.274} （A）<？in-line-formulae description =“在线公式“ end =” tail“？>
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