Patent ID: 8238398

Claim:
A diode laser comprising a heterostructure based on semiconductor compounds, said heterostructure containing at least one active layer, at least two confining layers, an emission leak-in region, said leak-in region being transparent for emission, said leak-in region containing at least a leak-in layer placed disposed between the active layer and a corresponding confining layer, at least on one side of the active layer, said diode laser further comprising an active region operable to conduct current during operation of the diode laser, optical facets, reflectors, an optical resonator, an ohmic contact, wherein in said heterostructure the ratio of the effective refractive index n eff of the heterostructure to the refractive index n IN of the leak-in layer (the ratio of n eff to n IN ) is determined from a range between one plus delta and one minus gamma, wherein delta and gamma being determined by a number much lesser than one and gamma being more than delta, and wherein at a predetermined distance from both lateral sides of the active region with flowing current emission confinement regions being located and penetrating from the external layer into the heterostructure at least to the active layer and further deep into the heterostructure, on the side of emission output on an optical facet there is provided an antireflection coating with a laser emission reflection coefficient near zero, and on the same side of emission output an optical resonator reflector with a laser emission reflection coefficient near one being formed, said reflector being adjacent to the active layer and to semiconductor layers of the heterostructure located on both sides of the active layer, the total thickness of said semiconductor layers being at least in the range from (λ/4n eff ) μm to (4λ/n eff ) μm, wherein λ is the free-space laser wavelength.