Patent ID: 8964808
Filing Date: 2015-02-24
Classification: H01S

Abstract:
1. A laser light source, comprising: a semiconductor layer sequence having an active region and a radiation coupling out area having a first partial region and a second partial region different than the first partial region; and a filter structure having at least one first filter element, wherein the active region generates, during operation of the laser light source, coherent first electromagnetic radiation having a first wavelength range and incoherent second electromagnetic radiation having a second wavelength range, the coherent first electromagnetic radiation is emitted by the first partial region along an emission direction, the incoherent second electromagnetic radiation is emitted by the first partial region and by the second partial region, the second wavelength range comprises the first wavelength range, the filter structure at least partly attenuates the incoherent second electromagnetic radiation emitted by the active region along the emission direction, the at least one first filter element has an angle dependent and/or a wavelength dependent transmissivity for electromagnetic radiation, the transmissivity of the at least one first filter element decreasing with increasing angle with respect to the emission direction and/or with increasing deviation from the first wavelength range, the at least one first filter element comprises a Bragg mirror, and the Bragg mirror has a wavelength dependent reflectivity having a global primary maximum and at least one local secondary maximum, and wherein the local secondary maximum lies in the first wavelength range.