Abstract

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.

© 2018 Optical Society of America

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