An intracavity, frequency-doubled self-Raman vortex laser

We demonstrate intracavity frequency doubling of the selfRaman field generated within a diode end-pumped, solid state Nd: GdVO4 vortex laser. A maximum output power of 727 mW is generated at 586 nm with an overall diode-to-yellow conversion efficiency of 4%. Conservation of orbital angular momentum is observed under intracavity frequency doubling, with the topological charge of the yellow beam being twice that of the Stokes beam. (C) 2014 Optical Society of America