Patent ID: 7787508

Claim:
An injection laser including a laser heterostructure containing at least an active layer consisting of at least one sublayer, at least one amplification region, edge facets, an optical resonator comprising reflectors, semiconducting layer for leak-in of emission, having refraction index n IN , output facets oriented under certain linear angles of inclination, and metallization layers, wherein in the heterostructure, between the reflectors of the optical resonator, in the direction of a longitudinal amplification axis of the laser heterostructure a sequence is placed, consisting of alternating amplification regions and output regions optically coupled to at least one adjacent amplification region, in each of the output regions together with layers of the said laser heterostructure there is a semiconducting layer for leak-in of emission, disposed on the outer surface of the output region of the laser heterostructure and raising above the outer surface of said amplification region, wherein every said output region is restricted on its opposite sides in the direction of the said longitudinal amplification axis by the output facets provided at certain linear angles of inclination α 1 and α 2 , correspondingly with respect to the external surface of the said amplification region, wherein the ratio of the refraction index n IN of the said leak-in layer to the effective refraction index n eff of the said heterostructure with the said leak-in layer included into it is equal to the number which is greater than one, wherein each amplification region comprises at least one metallization layer comprising at least one sub-layer, the metallization layer being disposed on the surface of the amplification region on the same side of the laser heterostructure as the semiconducting layer for leak-in of emission and wherein the emission transitions, inside the laser heterostructure, from the emission region of the sequence to the at least one adjacent output region of the same sequence.