Abstract:
A gain medium and an interband cascade laser, having the gain medium are presented. The gain medium can have one or both of the following features: (1) the thicknesses of the one or more hole quantum wells in the hole injector region are reduced commensurate with the thickness of the active hole quantum well in the active quantum well region, so as to place the valence band maximum in the hole injector region at least about 100 meV lower than the valence band maximum in the active hole quantum well; and (2) the thickness of the last wellof the electron injector region is between 85 and 110% of the thickness of the first active electron quantum well in the active gain region of the next stage of the medium.
Abstract:
To provide an oscillation device having a long oscillation wavelength (THz) in which wavelength variable width is relatively broad and wavelength sweep rate is relatively high. An oscillation device includes a gain medium (103) having a gain with respect to an electromagnetic wave to be oscillated, cavity structures (104, 105) for resonating the electromagnetic wave, and energy injection means (121, 122A) and for injecting pumping energy into the gain medium. The gain medium is sandwiched between a first negative permittivity medium (102, 112) and a second magnetic permittivity medium (101, 111) each of which real part of permittivity with respect to the electromagnetic wave is negative. Electric field application means (122B) is provided for at least one of the first negative permittivity medium and the second negative permittivity medium to apply an electric field for changing a depletion region formed at a boundary part with the gain medium.
Abstract:
A compound semiconductor device is provided that includes a substrate and an active region disposed above the substrate. The active region includes at least two different pseudomorphic layers, the first layer having the form InxGa1-xPyAszSb1-y-z, and the second layer having the form InqGa1-qPrAssSb1-r-s. The first layer includes at least In, Ga, and As, and the second layer includes at least Ga, As, and Sb. It is preferable for the substrate to be GaAs or AlpGa1-pAs (0
Abstract translation:提供了一种化合物半导体器件,其包括衬底和设置在衬底上方的有源区。 有源区包括至少两个不同的假晶层,第一层具有In x Ga 1-x P y As z Sb 1-y z的形式,并且第二层具有In q Ga 1-q Pr a SS Sb 1-r-s的形式。 第一层至少包含In,Ga和As,第二层至少包含Ga,As和Sb。 衬底最好是GaAs或AlpGa1-pAs(0
Abstract:
Described is a quantum-layer structure, for lasers and detectors in particular, with at least four semiconductor films (S1, S2, S3, S4), inner films (S2, S3) being located between two outer barrier films (S1, S4). The invention is characterized in that, without an electrical potential being applied, the lower edge of the conduction band of one of the inner films exhibits an absolute minimum and the lower edge of the valency band of another inner film exhibits an absolute maximum and that at least the two inner films which exhibit the absolute minimum and the absolute maximum have quantized hole or electron states.
Abstract:
The performance characteristics of ridge waveguide QCL may be improved in accordance with the invention by replacing the insulating dielectric layers such as SiO2, Si3N4 or SiC with p-type InP overgrowth layers as well as p- type AlInAs or InGaAsP overgrowth layers, for example .
Abstract translation:例如,通过用p型InP过度生长层以及p型AlInAs或InGaAsP过度生长层代替诸如SiO 2,Si 3 N 4或SiC的绝缘电介质层,可以改善脊波导QCL的性能特征。
Abstract:
A mid-infrared emitting indirect bandgap quantum well semiconductor laser with an optical waveguide structure having an active waveguide core. The active waveguide core comprises at least one repetition of a sub-region comprising in the following order a first wide bandgap barrier layer, a first conduction band layer of InAs, a valence band layer of Ga(1-x)InxSb where x >= 0.7, preferably of InSB (ie. x=1), having a thickness of less than 15 Angstroms, a second conduction band layer of InAs and a second wide bandgap barrier layer. The barrier layers co-operate to provide electrical confinement for the carriers within the intervening conduction band and valence band layers and optical confinement in the active core region is provided by the optical waveguide structure.
Abstract translation:具有具有有源波导芯的光波导结构的中红外发射间接带隙量子阱半导体激光器。 有源波导芯包括至少一个子区域的重复,该子区域按以下顺序包括第一宽带隙势垒层,InAs的第一导带层,Ga(1-x)In x Sb的价带层,其中x> = 0.7,优选为InSB(即x = 1),具有小于15埃的厚度,InAs的第二导带层和第二宽带隙势垒层。 阻挡层协同工作以为中间导带和价带层内的载流子提供电气限制,并且由光波导结构提供有源芯区域中的光限制。
Abstract:
A compound semiconductor device is provided that includes a substrate and an active region disposed above the substrate. The active region includes at least two different pseudomorphic layers, the first layer having the form InxGa1-xPyAszSb1-y-z, and the second layer having the form InqGa1-qPrAssSb1-r-s. The first layer includes at least In, Ga, and As, and the second layer includes at least Ga, As, and Sb. It is preferable for the substrate to be GaAs or AlpGa1-pAs (0
Abstract:
The infrared radiation source consists of a layer of GaSb (10) and a layer of InAs (11) which meet at an interface region (12) consisting of either GaAs or InSb. The two layers define a broken bandgap at the interface (12) and on application of a forward bias by means of contacts (13, 14) infrared radiation is produced at the interface. The interface exhibits negative differential resistance on application of a biasing voltage and the wavelength of the radiation is tunable in dependence on the size of the biasing voltage.