title: Picosecond optical vortex converted from multigigahertz self-mode-locked high-order Hermite-Gaussian Nd:GdVO(4) lasers.
abstract: We report on a gigahertz self-mode-locked high-order Hermite-Gaussian (HG) Nd:GdVO(4) laser. With a pump power of 2.2 W, the average output power for the TEM(0,m) modes from m=9 to m=0 are among 350-780 mW at a repetition rate of 3.5 GHz. The mode-locked pulse width is in the range of 20-25 ps for various HG TEM(0,m) modes. With a simple cylindrical-lens converter, the mode-locked HG beams are converted to generate picosecond optical vortex pulses.
authors.affiliation: Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: H C
authors.initials: HC
authors.lastname: Liang
authors.forename: Y J
authors.initials: YJ
authors.lastname: Huang
authors.forename: Y C
authors.initials: YC
authors.lastname: Lin
authors.forename: T H
authors.initials: TH
authors.lastname: Lu
authors.forename: Y F
authors.initials: YF
authors.lastname: Chen
authors.forename: K F
authors.initials: KF
authors.lastname: Huang