公开(公告)号：JP2001320136A

公开(公告)日：2001-11-16

申请号：JP2001136193

申请日：2001-05-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BAILLARGEON JAMES NELSON ,  CAPASSO FEDERICO ,  YI CHO ALFRED ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  PAIELLA ROBERT ,  SIVCO DEBORAH LEE

IPC: H01S5/343 ,  H01S5/042 ,  H01S5/065 ,  H01S5/22 ,  H01S5/227 ,  H01S5/34

Abstract: PROBLEM TO BE SOLVED: To provide a laser system where a self-mode synchronization is realized by laser transition itself. SOLUTION: A quantum cascade laser which utilizes inter-subband transition having a large nonlinear refractive index generates pico-second pulse of intermediate infrared light. A Kerr lens mode synchronization of QC laser is realized by nonlinearity in refractive index caused by laser transition is subband. The throttle in a cavity which is required for converting a QC self-convergence mechanism into loss modulation is realized with such QC laser waveguide as; (1) a layer with large optical loss which is separated from a semiconductor material by a relatively thin dielectrics layer, or (2) a relatively long laser waveguide. In an application example, a layer of large loss for mode connection is formed of metal, and so arranged as to constitute one of electrodes of a laser device.

公开(公告)号：JP2002344071A

公开(公告)日：2002-11-29

申请号：JP2001287724

申请日：2001-09-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BETHEA CLYDE GEORGE ,  CAPASSO FEDERICO ,  YI CHO ALFRED ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  MARTINI RAINER ,  PAIELLA ROBERTO ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO ,  WHITTAKER EDWARD ANTHONY

IPC: H01S5/042 ,  H04B10/00 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a method for optically transmitting data to a remote receiver. SOLUTION: The method for optically transmitting the data to the remote receiver comprises a step of receiving a stream of input data signal, a step of modulating a mid-IR laser by a direct modulation by a waveform having a sequential value corresponding to the stream of the data signals, a step of pumping the mid-IR laser, so as to generate high optical power level corresponding to a different value of the sequential value and a low optical power level from a direct modulation, and a step of transmitting the output signal from the modulated mid-IR laser to the remote receiver via a free space communications channel.

公开(公告)号：JP2002158404A

公开(公告)日：2002-05-31

申请号：JP2001201723

申请日：2001-07-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FEDERICO ,  YI CHO ALFRED ,  CHU SUNG-NEE GEORGE ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  SERGENT ARTHUR M ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO ,  MICHAEL CLEMONT WANK

IPC: H01S5/343 ,  H01S5/34

Abstract: PROBLEM TO BE SOLVED: To provide an ISB(inter-subband) SL(superlattice) emitter which comprises an almost flat mini band as well as a wave function which is spatially symmetric, and permits independent control of an applied electric field, derred operating wavelength, shape of the wave function, and energy position of the remaining state the mini band. SOLUTION: An RT region of an ISP optical emitter 10 comprises a pre-bias SL, and a plurality of split quantum wells (SPQWs). Here, the SPQW is a quantum well which is divided into a plurality of sub-wells by at least one barrier layer which is so thin that the energy state on upper side and lower side is separated over its natural width, to contribute to different mini bands in respective RT regions. On the contrary, the adjoining SPQWs are jointed each other by another barrier layer of such thickness as the mini band is generated across the RT regions.

公开(公告)号：JP2001291929A

公开(公告)日：2001-10-19

申请号：JP2001046367

申请日：2001-02-22

Applicant: LUCENT TECHNOLOGIES INC

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

IPC: G01N21/01 ,  G01N21/35 ,  G02B5/18 ,  H01S5/10 ,  H01S5/12 ,  H01S5/187 ,  H01S5/34 ,  H01S5/343

Abstract: PROBLEM TO BE SOLVED: To realize a laser of relatively long wavelength, which will not become extremely thick and still not be technically difficult to manufacture, such as like a DFB device. SOLUTION: A surface plasmon laser 10 has an active region 12 formed as an insulation ridge structure, and a metal surface layer 24 disposed in the major axis direction adjacent to the active region 12 along a ridge. According to this structure, surface plasmon propagation is formed, and power loss involved in invasion depth (skin depth) into metal is reduced greatly for a wavelength longer than 15 μm. A long wavelength laser is prepared, by using a large mode confinement in the reduced thickness of a waveguide layer (reduced from the conventional thickness of about 9 μm to 4 μm or smaller) which is obtained accordingly. The metal surface layer 24 has a metal grating (periodical) surface structure and DFB surface plasmon layer, which enables single mode light emission is formed thereby.

公开(公告)号：JPH11330629A

公开(公告)日：1999-11-30

申请号：JP11280899

申请日：1999-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FEDERICO ,  YI CHO ALFRED ,  FAIST JEROME ,  GMACHL CLAIRE F ,  NARIMANOV EVGUENI E ,  NOECKEL JENS U ,  SIVCO DEBORAH LEE ,  STONE ALFRED DOUGLAS

IPC: H01S5/00 ,  H01S3/08 ,  H01S3/083 ,  H01S5/065 ,  H01S5/10 ,  H01S5/323 ,  H01S5/343 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To provide a microcylinder type solid-state laser having by for an elevated output power and directivity of the output beam. SOLUTION: A solid-state laser 10 comprises a cylindrical resonator 12 having a curved boundary, and solid-state active region 12.1 located in the resonator, which is capable of generating a laser beam when it is pumped appropriately. The resonator has a comparatively high effective refractive index n (n>2, generally n>3) and a deformed shape sufficient for supporting at least a liberation mode (e.g. a V-mode or bow-tie type mode; the latter is preferable for generating a directive output of a comparatively high power), and for a specific example of a III-V compound semiconductor quantum cascade microcylindrical laser device, the resonator has a shape deformed according to a flat quadrupole deformation function from a circular shape.

公开(公告)号：DE69800148D1

公开(公告)日：2000-06-21

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：DE69924439T2

公开(公告)日：2006-02-16

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：DE69903372D1

公开(公告)日：2002-11-14

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.

公开(公告)号：DE69923890T2

公开(公告)日：2005-12-29

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：DE69927201D1

公开(公告)日：2005-10-20

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: H01S5/00 ,  H01S3/08 ,  H01S3/083 ,  H01S5/065 ,  H01S5/10 ,  H01S5/323 ,  H01S5/343 ,  H01S3/06 ,  H01S5/30

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.