575-fs passively mode-locked Yb:CaF
2
ceramic laser
Wang Cong
1, 2
, Hao Qian-Qian
1, 2
, Li Wei-Wei
3, ‡
, Huang Hai-Jun
4
, Wang Shao-Zhao
3
, Jiang Da-Peng
5, 6
, Liu Jie
1, 2, §
, Mei Bing-Chu
4
, Su Liang-Bi
5, 6
RF spectrum recorded on the time spans of 10 MHz and 1 GHz.