Abstract
By investigating the mode-locked pulse characteristics with varying pump power, we report on the soliton pulse breakup and multiple pulsing of a high power femtosecond Yb:KGW laser at a 10 W level of output power. The pulse breakup from single to double pulses at an output power of 6.3 W, exhibits a step-like abrupt change in the spectrum and temporal duration. Even under multiple pulsing operation, the mode-locked pulses follow the soliton-like pulse formation model such that the pulse duration is inversely proportional to the pulse energy and the time-bandwidth product is close to the transform limit. The multiple pulsing and breakup characterized in this study provide an efficient and reliable method to confirm the single pulse operation of high power mode-locked solid-state lasers.
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