Patent ID: 7756176
Filing Date: 2010-07-13
Classification: B82Y,H01S

Abstract:
1. An interband tunneling intersubband transition semiconductor laser comprising a first cladding layer, an active region structure layer, and a second cladding layer that are formed on a semiconductor substrate, and electrodes that are provided under the semiconductor substrate and above the second cladding layer respectively, wherein the active region structure layer includes a plurality of quantum well layers and a plurality of quantum barrier layers that are alternately stacked together to form a heterostructure that has a broken bandgap energy profile which allows interband tunneling to occur, wherein at least one quantum barrier layer includes two material layers having valence bands with different maximum valence energy levels, at least one quantum well layer includes three material layers having a middle material layer sandwiched between two outer material layers such that the middle layer has a conduction band with a minimum conduction energy level that is lower than minimum conduction energy levels of conduction bands of the other two material layers, and a lowest maximum valence energy level of the two material layers of the quantum barrier layer is higher than a highest minimum conduction energy level of the three materials layers of the quantum well layer.