title: ~1 mJ pulsed vortex laser at 1645 nm with well-defined helicity.
abstract: We report on a millijoule level Er:YAG ceramic pulsed vortex laser resonantly pumped by an annular beam at 1532 nm. By means of an uncoated YAG crystal plate inserting into the cavity and a proper thermal gradient on the ceramic, 1.03 mJ LG0,-1mode and 0.97 mJ LG0, + 1mode were respectively produced, and no vortex mode instability problem was observed. We believe the directly generated millijoule level optical vortex with well-defined helicity will have potential applications in material modification and processing, high-field laser physics, and nonlinear optics, etc.
authors.forename: Yongguang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Qiyao
authors.initials: Q
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Deyuan
authors.initials: D
authors.lastname: Shen