Zheng Li, Tian Wenlong, Liu Han, Wang Geyang, Bai Chuan, Xu Rui, Zhang Dacheng, Han Hainian, Zhu Jiangfeng, Wei Zhiyi
Opt Express. 2021 Apr 26;29(9):12950-12957. doi: 10.1364/OE.424139.
We report on a 2-GHz high-power Kerr-lens mode-locked Yb:KGW laser pumped by a single-mode fiber laser. The output performance for two different output coupling rates was investigated. Stable bidirectional mode-locking operation at the repetition rate of 2.157 GHz was obtained with a 0.6% output coupler. The average output powers of bidirectional operation are 741 mW and 746 mW, with 123-fs and 126-fs pulse durations, respectively. By using a 1.6% output coupler, unidirectional mode-locking is achieved with 145-fs pulse duration and 1.7-W average output power, which, to the best of our knowledge, is the highest average power from Kerr-lens mode-locked GHz femtosecond oscillators.
