100 W orbital angular momentum laser at 2 µm

• DOI: 10.1364/ol.551090
• Publication Date: 2025-01-29T16:01:12Z
• Authors: Heng Ding; Zihao Tong; Changsheng Zheng; Tianxiang Meng; Wenlong Wei; Lei Zhu; Yinyin Wang; Dazhi Lu; Yongguang Zhao; Haohai Yu; Huaijin Zhang

Direct power scaling of an at-source scalar orbital angular momentum (OAM) laser is demonstrated in a Ho:YAG single-crystal fiber (SCF). Benefiting from the long gain region and large surface-to-volume ratio this fiber-like geometric structure, 100 W optical vortex (OAM = ℏ ) with high slope efficiency 66.0% achieved at 2.1 µm, which is, to best our knowledge, record OAM 2 µm spectral range opens new route for direct generation high-power, high-efficiency structure light beams.