Abstract: A laser device comprising a pump source (10) operable to generate a pump beam (11) for a resonant cavity in which a laser medium (74) is arranged. A beam-shaping waveguide element (18) is arranged between the pump source and the resonant cavity. Shaping of the pump beam is achieved by tailoring the refractive index profile of the waveguide element (18) so that it yields an intensity distribution which spatially overlaps a desired ring-shaped Laguerre-Gaussian mode of the resonant cavity sufficiently well to achieve laser oscillation on said desired Laguerre-Gaussian mode. A ring-shaped or doughnut-shaped laser beam profile can thus be generated. It is further possible to design the refractive index profile (76) so that the pump beam's intensity distribution also spatially overlaps the fundamental mode of the resonant cavity sufficiently well to achieve laser oscillation also on said fundamental mode. The laser will then lase on both the fundamental mode and the selected Laguerre-Gaussian mode.