A diode-pumped Tm-doped double-clad fiber-optic amplifier is reported that provides up to of peak power at pulse durations of and a repetition rate of . When the repetition rate is increased to , the peak power drops to , while the average output power of the amplifier stays at with a slope efficiency of 34.9%. As an amplifier the fiber can be saturated by a very low average launched input power of only at and yields the same average output power as in a fiber laser or amplified spontaneous emission source setup for all the repetition rates investigated. The peak powers reported are to the author’s knowledge the highest generated by Tm-doped fiber lasers or amplifiers at repetition rates above with simultaneously short pulse durations of .
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