Centimeter-scale Yb-free heavily Er-doped silica fiber laser

Optics Letters
Fan WangLili Hu

Abstract

The laser behavior of a centimeter-scale Er3+/Al3+ 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 Er3+ ion concentration as high as 1.32×1020  ions/cm3 and an Al/Er mole ratio of 10. The high doping homogeneity of Er3+ ions in the fiber core was confirmed by an electron probe microanalyzer element scanning, long Er3+:  I13/24 emission lifetime of 11.4 ms, and low refractive index fluctuation of fiber core (±1×10-4). 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 CO2 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.

References

Apr 7, 2003·Optics Express·Jens LimpertC Jakobsen
Dec 1, 1993·Optics Letters·J L WagenerD J Digiovanni
Nov 3, 2009·Optics Letters·Mikhail E LikhachevAleksei N Guryanov
Apr 1, 2011·Optics Express·Amos Martinez, Shinji Yamashita
Apr 27, 2012·Optics Express·Ihor PavlovF Ömer Ilday

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