Original Research Published on 10 Jan 2020 Low Threshold, High Efficiency Passively Mode-Locked Picosecond Tm,Ho:LiLuF4 Laser in Optics and Photonics Weijun LingTao XiaRui SunChen ChenQiang XuYani Zhang Frontiers in Physics doi 10.3389/fphy.2019.00216 3,008 views 5 citations