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Dual-wavelength radiation around 1044 nm and 1070 nm has been generated directly from a cladding pumped Yb-doped fiber laser. Outputs of the two wavelengths exhibit sustained relaxation oscillation with anticorrelated dynamics. Modeling of the transient built up of the free-running laser shows the two-wavelength behavior can be attributed to the existence of two gain peaks of Yb-doped fiber under intermediate pump conditions.
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Pan et al. (2009) studied this question.
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