title: Stable donutlike vortex beam generation from lasers with controlled Ince-Gaussian modes.
abstract: This study proposes a three-lens configuration for generating a stable donutlike vortex laser beam with controlled Ince-Gaussian mode (IGM) operation in the model of laser-diode (LD)-pumped solid-state lasers. Simply controlling the lateral off-axis position of the pump beam's focus on the laser crystal can generate a desired donutlike vortex beam from the proposed simple and easily made three-lens configuration, a proposed astigmatic mode converter assembled into one body with a concave-convex laser cavity.
authors.affiliation: Department of Physics, National Cheng Kung University, No 1, University Road, Tainan City 701, Taiwan. scchu@mail.ncku.edu.tw
authors.forename: Shu-Chun
authors.initials: SC
authors.lastname: Chu
authors.forename: Kenju
authors.initials: K
authors.lastname: Otsuka