Patent ID: 9157604
Filing Date: 2015-10-13
Classification: F21K,F21V,F21Y,G03B

Abstract:
1. A device for generating white light, comprising: at least one laser that emits a parallel light bundle in the blue and/or ultraviolet spectral range; at least one conversion medium that emits converted light at an opening angle; an optical system including a single member that focuses the parallel light bundle onto the at least one conversion medium such that the focus of the parallel light bundle is in the conversion medium and such that the conversion medium converts at least part of the light into a different spectral range, the optical system having a numeric aperture that is greater than 0.3 so as to focus the parallel light bundle onto a correspondingly small focal spot of the conversion medium; and optics downstream of the at least one conversion medium in a direction of light propagation towards a light-utilizing device, the optics being configured to reduce the opening angle of the light converted by the at least one conversion medium, wherein the optical system and the optics comprise a common focusing optical element arranged on a first side of the conversion medium together with a reflecting device that directs a portion of the parallel light bundle to the light-utilizing device through a dichroic mirror, whereas another portion of the parallel light bundle is directed to the conversion medium through the common focusing optical element and back to the dichroic mirror and directed to the light-utilizing device.