A passive optical resonator is used to enhance the power of a pulsed repetition rate Yb laser providing pulses. We find limitations relating to the achievable time-averaged and peak power, which we distinguish by varying the duration of the input pulses. An intracavity average power of is generated with close to Fourier-limited pulses of average power. Beyond this power level, intensity-related effects lead to resonator instabilities, which can be removed by chirping the seed laser pulses. By extending the pulse duration in this way to , we could obtain of intracavity circulating power with of input power.
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