Patent ID: 8867586

Claim:
A diode laser, comprising: an active layer including an exit facet; an external frequency-selective element for wavelength stabilization of a laser radiation, wherein the external frequency-selective element comprises an entry surface facing the exit facet and an exit surface facing away from the exit facet and is designed as a volume Bragg grating; and a collimator unit for collimating the laser radiation emitting from the exit facet and passing through the external frequency-selective element in a divergent form; wherein the external frequency-selective element is arranged between the collimator unit and the exit facet, wherein the external frequency-selective element is designed in such a manner that the divergence of the radiation emitting from the exit facet is reduced during passage through the external frequency-selective element, wherein a ratio of the refractive power of the external frequency-selective element to the refractive power of the collimator unit is between 0.1 and 10.