2.7 μm optical vortex beam directly generated from an Er:Y2O3 ceramic laser

Manman Ding; Ying Chen; Jun Wang; Danlei Yin; Ying Wang; Peng Liu; Yongguang Zhao; Dingyuan Tang; Deyuan Shen; Ying Liu; Zhengping Wang; Xinguang Xu; Valentin Petrov

doi:10.1364/OL.44.004973

2.7 μm optical vortex beam directly generated from an Er:Y₂O₃ ceramic laser

Opt Lett. 2019 Oct 15;44(20):4973-4976. doi: 10.1364/OL.44.004973.

Authors

Manman Ding, Ying Chen, Jun Wang, Danlei Yin, Ying Wang, Peng Liu, Yongguang Zhao, Dingyuan Tang, Deyuan Shen, Ying Liu, Zhengping Wang, Xinguang Xu, Valentin Petrov

PMID: 31613242
DOI: 10.1364/OL.44.004973

Abstract

We demonstrate, to the best of our knowledge, the first direct vortex beam generation in the 3 μm spectral region by employing an Er:Y₂O₃ ceramic laser. Controllable handedness with high purity is achieved by introducing asymmetric cavity loss and reducing the number of longitudinal modes. The average orbital angular momentum of the produced scalar vortex beam is quantitatively evaluated to be 0.95ħ for the LG_0,+1 mode and -0.94ħ for the LG_0,-1 mode. The corresponding optical spectrum is centered at 2710.8 and 2710.5 nm, respectively.