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

IPC: H01S5/00 ,  H01S5/042 ,  H01S5/062 ,  H01S5/0625 ,  H01S5/34 ,  H01S5/343 ,  H01S5/30

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.

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.

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

IPC: H01L29/06 ,  H01L29/15 ,  H01S5/34 ,  H01S5/343

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.

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

IPC: H01S5/00 ,  H01S5/042 ,  H01S5/10 ,  H01S5/323 ,  H01S5/34 ,  H01S5/343 ,  H01S5/30

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.

公开(公告)号：DE69903372T2

公开(公告)日：2003-07-10

申请号：DE69903372

申请日：1999-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FREDERICO ,  YI CHO ALFRED ,  FAIST JEROME ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO

IPC: H01S5/00 ,  H01S5/042 ,  H01S5/30 ,  H01S5/34 ,  H01S5/343

Abstract: A novel superlattice quantum cascade (SLQC) laser has undoped SL active regions, with the dopant concentration in the injector region being selected, such that, under an appropriate electrical bias, the SL active region is substantially electric field free. The absence of dopant atoms in the SL active region results in reduced carrier scattering and reduced optical losses, with consequent low threshold current and/or room temperature operation. The novel laser emits in the mid-IR spectral region and can be advantageously used in measurement or monitoring systems, e.g., in pollution monitoring systems.