Max-Planck-Institut für Quantenoptik, Garching, Germany.
Opt Lett. 2012 Sep 1;37(17):3543-5. doi: 10.1364/OL.37.003543.
We demonstrate a self-starting Kerr-lens mode-locked (KLM) Yb:YAG thin-disk oscillator operating in the regime of positive intracavity group-delay dispersion (GDD). It delivers 1.7 ps pulses at an average power of 17 W and a repetition rate of 40 MHz. Dispersive mirrors compress the pulses to a duration of 190 fs (assuming sech2 shape; Fourier limit: 150 fs) at an average power level of 11 W. To our knowledge, this is the first KLM thin-disk oscillator with positive GDD. Output powers of up to 30 W were achieved with an increased output coupler transmission and intracavity GDD. We demonstrate increase of the pulse energy with increasing positive intracavity GDD, limited by difficulties in initiating mode-locking.
我们展示了一种自启动的克尔透镜锁模（KLM）Yb:YAG 薄圆盘振荡器，其工作在腔内群延迟色散（GDD）为正的状态。它在平均功率为 17 W 和重复率为 40 MHz 的条件下输出 1.7 ps 脉冲。色散镜将脉冲压缩至 190 fs 的持续时间（假设 sech2 形状；傅里叶极限：150 fs），平均功率为 11 W。据我们所知，这是第一个具有正 GDD 的 KLM 薄圆盘振荡器。通过增加输出耦合器的透射率和腔内 GDD，实现了高达 30 W 的输出功率。我们证明了随着腔内正 GDD 的增加，脉冲能量也会增加，但受到模式锁定启动困难的限制。
