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Dependence of mode instabilities (MI) on ytterbium dopant concentrations inhigh power fiber amplifiers has been investigated. It is theoretically shownthat, by only varying the fiber length to maintain the same total small-signalpump absorption, the MI threshold is independent of dopant concentration. MIthresholds of gain fibers with ytterbium dopant concentration of 5.93X10^25/m3and 1.02X10^26/m3 have been measured, which exhibit similar thresholds andagree with theoretical results. The result indicates that heavy doping ofactive fiber can be adopted to suppress nonlinear effects without decreasing MIthreshold, which provides a method of maximizing the power output of fiberlaser, taking into account the stimulated Brillouin scattering, stimulatedRaman Scattering, and MI thresholds simultaneously.

Study of dopant concentrations on thermal induced mode instability in high power fiber amplifiers