Patent ID: 10061132

Abstract:
A beam scanning device includes a variable-wavelength laser that emits a laser beam, a plane-wave converting unit that converts the laser beam into a plane-wave laser beam, a light-intensity-distribution converting unit including a first light-intensity-distribution converting unit set to be obliquely tilted with respect to an emitting direction of the laser beam within a horizontal plane and a second light-intensity-distribution converting unit set to be obliquely tilted with respect to the emitting direction of the laser beam within a plane perpendicular to the horizontal plane and parallel to the emitting direction of the laser beam, the light-intensity-distribution converting unit converting a peak position of light intensity of the plane-wave laser beam according to a wavelength of the plane-wave laser beam, and a spherical-wave converting unit that converts the plane-wave laser beam, the peak position of the light intensity of which is converted, into a spherical-wave laser beam.