Energy-transfer efficiency in the Er/Yb-codoped waveguide ring laser under sinusoidally modulated pump.
The response of an Er/Yb-codoped waveguide ring laser to a sinusoidally modulated pump power is studied. Experimentally, resonance peaks are observed and their dependences on the average pump power and the modulation index are analyzed. For high modulation indexes bistable behaviour is found. Numerically, a good agreement is obtained for the resonance peak frequencies by using a straightforward approximate model and assuming a dependence on the average pump power of the macroscopic Yb ? Er energy-transfer coefficient. This dependence can be related to these mechanisms' performance for high doping and pump levels when examined in a microscopic statistical formalism.
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