摘要:
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit lasing of high order modes. This limits the slow axis divergence of a beam emitted by the laser.
摘要:
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit lasing of high order modes. This limits the slow axis divergence of a beam emitted by the laser.
摘要:
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit lasing of high order modes. This limits the slow axis divergence of a beam emitted by the laser.
摘要:
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit lasing of high order modes. This limits the slow axis divergence of a beam emitted by the laser.
摘要:
A semiconductor laser of the heterostructure type is grown on a p-type substrate and has a plurality of p-type active layers. In a preferred embodiment, the active layers are grown by liquid phase epitaxy from a single melt which is maintained just below its equilibrium temperature and is cooled very slowly during deposition. As a result, the active layers are substantially identical in composition and have a very low lattice mismatch. They emit light at characteristic wavelengths within 50 angstroms of each other, indicating that their modal gain envelopes coincide. This condition minimizes the threshold current.
摘要:
A separate confinement heterostructure includes a quantum-well layer bounded by an n-side waveguide layer and a p-side waveguide layer. The waveguide layers guide a lasing mode of the heterostructure. The n-side waveguide layer is composed of indium gallium phosphide (InGaP) and the p-side layer is composed of aluminum gallium arsenide (AlGaAs). The heterostructure is configured such that more than 80% of the optical mode propagates in the n-side waveguide layer.
摘要:
A type II staggered alignment multiple quantum well (MQW) is integrated into a laser cavity to implement an active Q-switched device. The MQW initially absorbs and stores energy to prevent the device from lasing. In response to an applied electric field, the MQW experiences a sudden charged carrier population inversion and emits a strong, short duration pulse having a directionality conincident with that of the beam within the lasing cavity. A generalization of the invention involves optical amplification in which photon energy is first stored in a type II staggered alignment MQW, followed by the simultaneous application of an electric field and an optical beam to the MQW, such that the stored energy is released in a sudden pulse which is amplified with respect to the applied optical beam, and is co-directional with the applied beam.
摘要:
A mid-IR laser is provided having novel AlAs/Al.sub.x Ga.sub.1-x Sb or InAs/Al.sub.x Ga.sub.1-x Sb superlattice cladding regions. The arsenide layers of the n-type cladding region are doped n-type, utilizing silicon, and may be used with conventional active region materials, such as InAs.sub.z Sb.sub.1-z and In.sub.w Ga.sub.1-w As.sub.y Sb.sub.1-y. The novel cladding regions can be deposited without the use of Group VI elements, such as Te, which are not preferred source materials for MBE growth. Furthermore, the need for quaternary layers, such as Al.sub.x Ga.sub.1-x As.sub.y Sb.sub.1-y, used in the prior art devices, is eliminated; consequently, the need for precise control of two Group V fluxes (As and Sb) is eliminated.
摘要翻译:提供了具有新型AlAs / Al x Ga 1-x Sb或InAs / Al x Ga 1-x Sb超晶格包层区的中红外激光器。 n型包层区的砷化物层利用硅掺杂为n型,并且可以与诸如InAszSb1-z和InwGa1-wAsySb1-y的常规有源区材料一起使用。 新颖的包层区域可以不使用VI族元素(如Te)沉积,这些元素不是MBE生长的优选源材料。 此外,消除了对在现有技术装置中使用的四元层,例如Al x Ga 1-x As y Sb 1-y的需要; 因此,消除了对两组V通量(As和Sb)进行精确控制的需要。
摘要:
High speed Group III-Sb materials are n-doped in a molecular beam epitaxy process by forming a superlattice with n-doped strained layers of a Group III-V compound upon Group III-Sb base layers. The base layers have lower conduction band energy levels than the strained layers, and allow doping electrons from the strained layers to flow into the base layers. The base layers preferably comprise Al.sub.x Ga.sub.1-x Sb, while the strained layers preferably comprise a binary or ternary compound such as Al.sub.y Ga.sub.1-y As having a single Group V component, where x and y are each from 0 to 1.0. The strained layers can be n-doped with silicon or tin, which would produce p-type doping if added directly to the base layers.
摘要翻译:通过在III-Sb基层上形成具有III-V族化合物的n掺杂应变层的超晶格,在分子束外延工艺中n掺杂高速III-Sb族材料。 基层具有比应变层更低的导带能级,并允许从应变层掺杂电子流入基层。 基层优选包含Al x Ga 1-x Sb,而应变层优选包含二元或三元化合物,例如具有单一V族组分的AlyGa1-yAs,其中x和y各自为0至1.0。 应变层可以用硅或锡进行n掺杂,如果直接添加到基层,则会产生p型掺杂。
摘要:
High speed Group III-Sb materials are n-doped in a molecular beam epitaxy process by forming a superlattice with n-doped strained layers of a Group III-V compound upon Group III-Sb base layers. The base layers have lower conduction band energy levels than the strained layers, and allow doping electrons from the strained layers to flow into the base layers. The base layers preferably comprise Al.sub.x Ga.sub.1-x Sb, while the strained layers preferably comprise a binary or ternary compound such as Al.sub.y Ga.sub.1-y As having a single Group V component, where x and y are each from 0 to 1.0. The strained layers can be n-doped with silicon or tin, which would produce p-type doping if added directly to the base layers.
摘要翻译:通过在III-Sb基层上形成具有III-V族化合物的n掺杂应变层的超晶格,在分子束外延工艺中n掺杂高速III-Sb族材料。 基层具有比应变层更低的导带能级,并允许从应变层掺杂电子流入基层。 基层优选包含Al x Ga 1-x Sb,而应变层优选包含二元或三元化合物,例如具有单一V族组分的AlyGa1-yAs,其中x和y各自为0至1.0。 应变层可以用硅或锡进行n掺杂,如果直接添加到基层,则会产生p型掺杂。