Patent ID: 7936798

Claim:
Nitride based laser diode, comprising crystalline substrate on which in sequence a set of n-type layers, an optically active set of layers and a set of p-type layers is grown, while said set of n-type layers comprises at least a buffer layer, a bottom n-type cladding layer and a bottom n-type waveguide layer and whereas said set of p-type layers comprises at least an upper p-type waveguide layer containing an electron blocking layer (EBL), an upper p-type cladding layer and a p-type contact layer, characterized in that the said electron blocking layer comprises a magnesium doped alloy In x Al y Ga 1-x-y N where 1>x>0.001 and 1>y>0 and wherein a hydrogen concentration in said electron blocking layer is less than 5×10 17 cm −3 .