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Applied Physics B

Metastable-state lifetime of erbium ions measured through delayed absorption in the fiber propagation direction

K. Kuroda, Mami Nakandakari, Yuzo Yoshikuni

Published Mar 14, 2017• 9 citations
Publisher
DOI
10.1007/s00340-017-6674-2

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Abstract We report the measurement of the metastable-state lifetime of erbium ions doped in a fiber. We apply the pump–probe technique with a wavelength-tunable laser array. This technique allows us to measure the lifetime through delayed absorption in the fiber propagation directions. By tuning the wavelength of the pump–probe pulse pairs to a low absorption wavelength, the lifetime of the metastable state is successfully measured in a 5-m-long fiber. The lifetime is determined to be 10.0 ms, which agrees well with previously reported values.
The slow light propagation in optical fiber has attracted much attention because of its practical applications. Use of coherent population oscillation to produce slow light propagation has many advantages over other methods. We investigate the reduction of the group velocity propagation by the coherent population oscillation in erbium-doped optical fiber, and also the relationship between the population of metastable state and the time delay by changing the doping concentration, the length of the fiber, the input power, and the pump power. The results show that we can select a high doping concentration of erbium in the fiber, increase the length of the fiber, decrease the pump power and select the appropriate power of the signal light to increases the time delay.