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公开(公告)号：DE60007959T2
公开(公告)日：2004-12-23
申请号：DE60007959
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , CHO ALFRED YI , CHU SUNG-NEE GEORGE , GMACHL CLAIRE F , KOEHLER RUEDEGER , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: An article comprising a QC-DFB laser is disclosed. In the QC-DFB laser (10), an overlying grating structure achieves relatively strong coupling of the guided mode to the grating, and is thus highly effective in inducing single-mode operation even under cw operating conditions. The grating structure includes grooves (25) etched in a plasmon-enhanced confinement layer (PECL) (22) disposed adjacent and in contact with an upper metallic electrode (23). The grating structure and the PECL (22) are designed such that in the grooves (25), the laser mode travelling in the waveguide can couple efficiently to the surface-plasmon at the electrode interface. This results in strong modulation of the laser mode, leading to strong modulation of, inter alia, the effective refractive index.
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公开(公告)号：DE60102343D1
公开(公告)日：2004-04-22
申请号：DE60102343
申请日：2001-05-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , CHO ALFRED YI , CHU SUNG-NEE GEORGE , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SERGENT ARTHUR MIKE , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO , WANKE MICHAEL CLEMENT
Abstract: The RT regions of an ISB light emitter comprise pre-biased SLs and a multiplicity of split quantum wells (SPQWs). A SPQW is a quantum well that is divided into a multiplicity of sub-wells by a first barrier layer sufficiently thin that the upper and lower energy states are split beyond their natural broadening and contribute to different minibands in each RT region. In contrast, adjacent SPQWs are coupled to one another by second barrier layers. The thicknesses of the latter layers are chosen so that minibands are created across each RT region. In one embodiment, the emitter includes an I/R region between adjacent RT regions, and in another embodiment the I/R regions are omitted.
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公开(公告)号：DE69903200D1
公开(公告)日：2002-11-07
申请号：DE69903200
申请日：1999-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , CHO ALFRED YI , CHU SUNG-NEE GEORGE , FAIST JEROME , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE
Abstract: A quantum cascade (QC) laser has a multilayer core region comprising alternating layers of a first and a second semiconductor material, with lattice constants a1 and a2, respectively. The first material is selected such that a1 > ao, where ao is the lattice constant of the substrate (typically InP), and the second material is selected such that a 2 ao. The materials are also selected such that the conduction band discontinuity DELTA Ec between the first and second materials is greater than 520 meV in absolute value. The multilayer core comprises a multiplicity of essentially identical multilayer repeat units. The layer thicknesses and materials of the repeat units are selected to substantially provide strain compensation over a repeat unit. QC lasers according to this invention preferably comprise a distributed feedback feature, (e.g., a Bragg grating) selected to ensure single mode laser emission, and can be designed for operation at a wavelength in the first atmospheric window, typically about 3-5 mu m. Such lasers can advantageously be used for absorption spectroscopy, e.g., for emission monitoring.
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公开(公告)号：DE69900427D1
公开(公告)日：2001-12-13
申请号：DE69900427
申请日：1999-05-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAILLARGEON JAMES NELSON , CAPASSO FEDERICO , CHO ALFRED YI , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: A novel quantum cascade (QC) laser comprises a multiplicity of identical repeat units, with each repeat unit comprising an active region and an injector region. The injector region comprises quantum wells and barriers, selected to facilitate, under appropriate bias, resonant carrier transport from a lower energy level of a given active region to an upper energy level of an adjacent downstream active region. Carrier transition from the energy level to a lower energy level of an active region results in emission of infrared radiation. The laser is advangeously used in, e.g., a measurement system for detection of trace compounds in air.
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公开(公告)号：DE69800148T2
公开(公告)日：2001-01-11
申请号：DE69800148
申请日：1998-03-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , YI CHO ALFRED , FAIST JEROME , HUTCHINSON ALBERT LEE , SIRTORI CARLO , SIVCO DEBORAH LEE
Abstract: In a novel tunable semiconductor intersubband laser (111), the lasing transition (41) is a non-resonant tunneling transition, with the frequency of the emitted photon depending on the electrical bias across the multi-period active region (12) of the laser. The laser can be designed to emit in the mid-IR, and can advantageously be used for, e.g., trace gas sensing.
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Patent Agency Ranking
公开(公告)号：DE69927201T2
公开(公告)日：2006-06-29
申请号：DE69927201
申请日：1999-04-13
Applicant: LUCENT TECHNOLOGIES INC , MAX PLANCK GESELLSCHAFT , UNIV YALE NEW HAVEN
Inventor： CAPASSO FEDERICO , YI CHO ALFRED , FAIST JEROME , GMACHL CLAIRE F , NARIMANOV EVGUENI E , NOECKEL JENS U , SIVCO DEBORAH LEE , STONE ALFRED DOUGLAS
IPC: H01S3/06 , H01S5/00 , H01S3/08 , H01S3/083 , H01S5/065 , H01S5/10 , H01S5/30 , H01S5/323 , H01S5/343
Abstract: A solid state laser comprises a cavity resonator in the form of a generally cylindrical body and, located within the resonator, an active region which generates lasing light when suitably pumped. The resonator has a relatively high effective refractive index (n > 2 and typically n > 3) is sufficiently deformed from circularity so as to support at least one librational mode (e.g., a V-shaped or a bow-tie mode, the latter being presently preferred for generating relatively high power, directional outputs). Specifically described is a Group III-V compound semiconductor, quantum cascade (QC), micro-cylinder laser in which the resonator has a flattened quadrupolar deformation from circularity. This laser exhibits both a highly directional output emission and a three-order of magnitude increase in optical output power compared to conventional semiconductor micro-cylinder QC lasers having circularly symmetric resonators.
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公开(公告)号：DE69924439D1
公开(公告)日：2005-05-04
申请号：DE69924439
申请日：1999-09-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FREDERICO , YI CHO ALFRED , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: Instead of trying to keep the SLs of a QC laser field free, we "pre-bias" the actual electronic potential by varying the SL period (and hence average composition) so as to achieve an essentially flat profile, on average, of upper and lower minibands, despite the presence of an applied field in the SLs. In one embodiment, in at least a first subset of the QW layers, the thicknesses of the QW layers are varied from QW layer to QW layer so as to increase in the direction of the applied field. In this embodiment, the upper and lower lasing levels are located, in the absence of an applied electric field, each at different energies from layer to layer within the first subset, so that despite the presence of an applied field, the desired flatband condition of the upper and lower minibands is realized. In a preferred embodiment, the thicknesses of the QW layers within the first subset are varied from QW layer to QW layer so as to increase in the direction of the applied field, and the thicknesses of a second subset of the barrier layers are also varied from barrier layer to barrier layer so as to decrease or increase in the direction of the applied field.
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公开(公告)号：DE69923890D1
公开(公告)日：2005-04-07
申请号：DE69923890
申请日：1999-07-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , YI CHO ALFRED , GMACHL CLAIRE F , HUTCHINSON ALBERT LEE , SIVCO DEBORAH LEE , FAIST JEROME , SIRTORI CARLO
Abstract: A long wavelength (e.g., mid-IR to far-IR) semiconductor laser comprises an active region and at least one cladding region characterized in that the cladding region includes a light guiding interface between two materials which have dielectric constants opposite in sign. Consequently, the guided modes are transverse magnetic polarized surface waves (i.e., surface plasmons) which propagate along the interface without the need for a traditional dielectric cladding. In a preferred embodiment, the interface is formed between a semiconductor layer and a metal layer. The complex refractive index of the metal layer preferably has an imaginary component which is much larger than its real component. In an illustrative embodiment, our laser includes a Quantum cascade active region sandwiched between a pair of cladding regions one of which is a guiding interface based on surface plasmons and the other of which is a dielectric (e.g., semiconductor) structure.
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公开(公告)号：CA2349263C
公开(公告)日：2005-01-11
申请号：CA2349263
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GMACHL CLAIRE F , CAPASSO FEDERICO , PAIELLA ROBERTO , SERGENT ARTHUR MIKE , TREDICUCCI ALESSANDRO , CHO ALFRED YI , SIVCO DEBORAH LEE , HUTCHINSON ALBERT LEE , BAILLARGEON JAMES NELSON , HWANG HAROLD YOONSUNG
Abstract: In a mesa geometry semiconductor laser, a patterned dielectric coating used to define the stripe geometry contact on the top the mesa and to provide significant waveguiding comprises a chalcogenide glass. Applications to intersubband (e.g., quantum cascade) lasers are specifically described.
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公开(公告)号：DE60007959D1
公开(公告)日：2004-03-04
申请号：DE60007959
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAPASSO FEDERICO , CHO ALFRED YI , CHU SUNG-NEE GEORGE , GMACHL CLAIRE F , KOEHLER RUEDEGER , SIVCO DEBORAH LEE , TREDICUCCI ALESSANDRO
Abstract: An article comprising a QC-DFB laser is disclosed. In the QC-DFB laser (10), an overlying grating structure achieves relatively strong coupling of the guided mode to the grating, and is thus highly effective in inducing single-mode operation even under cw operating conditions. The grating structure includes grooves (25) etched in a plasmon-enhanced confinement layer (PECL) (22) disposed adjacent and in contact with an upper metallic electrode (23). The grating structure and the PECL (22) are designed such that in the grooves (25), the laser mode travelling in the waveguide can couple efficiently to the surface-plasmon at the electrode interface. This results in strong modulation of the laser mode, leading to strong modulation of, inter alia, the effective refractive index.
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