The laser behavior of a centimeter-scale ${\mathrm{Er}}^{3+}/{\mathrm{Al}}^{3+}$ codoped silica fiber with core numerical aperture and core diameter of 0.15 and 8 μm, respectively, is reported. The core glass was prepared by the sol–gel method combined with high-temperature sintering; it contained ${\mathrm{Er}}^{3+}$ ion concentration as high as $1.32\times {10}^{20}\text{ions}/{\mathrm{cm}}^3$ and an Al/Er mole ratio of 10. The high doping homogeneity of ${\mathrm{Er}}^{3+}$ ions in the fiber core was confirmed by an electron probe microanalyzer element scanning, long ${\mathrm{Er}}^{3+}\text{:}{}^4{\mathrm{I}}_{13/2}$ emission lifetime of 11.4 ms, and low refractive index fluctuation of fiber core ($\pm 1\times {10}^{-4}$). The signal gain of fibers with 4.6 cm, 10 cm, and 16 cm lengths was tested in the 1500–1620 nm range. A gain of 7 dB is achieved at 1560 nm in a 16-cm-long EDF under 230 mW pump power. Aimed for ${\mathrm{CO}}_2$ sensor application, the laser behavior of Er/Al codoped fiber was tested at 1572 nm. A slope efficiency of 12% and an output power of 15 mW were achieved in a 10-cm-long fiber under 166 mW absorbed pump power. The newly developed silica fiber is promising for use in high-repetition-rate lasers.

中文翻译：

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厘米级无Y重掺silica石英光纤激光器

厘米级的激光行为 ${尔}^{3+}/{铝}^{3+}$据报道，共掺杂石英纤维的纤芯数值孔径和纤芯直径分别为0.15和8μm。芯玻璃是通过溶胶-凝胶法结合高温烧结制备的。它包含${尔}^{3+}$ 离子浓度高达 $1.32\times {10}^{20}\text{离子}/{\mathrm{厘米}}^3$ Al / Er摩尔比为10。 ${尔}^{3+}$ 纤芯中的离子通过电子探针显微分析仪扫描确认，很长 ${尔}^{3+}\text{：}{}^4{\mathrm{一世}}_{13/\mathrm{2个}}$ 发射寿命为11.4毫秒，并且纤芯的折射率波动小（$\pm \mathrm{1个}\times {10}^{-4}$）。在1500-1620 nm范围内测试了4.6 cm，10 cm和16 cm长度的光纤的信号增益。在230 mW的泵浦功率下，在16厘米长的EDF中，在1560 nm处可获得7 dB的增益。旨在${\mathrm{一氧化碳}}_{\mathrm{2个}}$在传感器应用中，Er / Al共掺杂光纤的激光行为在1572 nm下进行了测试。在166 mW的吸收泵浦功率下，一根10厘米长的光纤的斜率效率为12％，输出功率为15 mW。新开发的石英纤维有望用于高重复频率的激光器。