公开(公告)号：JPH10321951A

公开(公告)日：1998-12-04

申请号：JP4360898

申请日：1998-02-25

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BAILLARGEON JAMES NELSON ,  CAPASSO FEDERICO ,  CHO ALFRED YI ,  FAIST JEROME ,  GMACHI CLAIRE F ,  SIRTORI CARLO ,  SIVCO DEBORAH LEE

IPC: H01S5/00 ,  H01S5/06 ,  H01S5/062 ,  H01S5/12 ,  H01S5/34 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To provide a QC(quantum cascade) laser, which operates at a temperature higher than or equal to a ultra-low temperature, performs single-mode laser radiation, and makes continuous modulations possible over a wide wavelength region. SOLUTION: A quantum cascade laser 10 is provided with a first clad region 11, a second clad region 13, a core region 12 arranged between the regions 11 and 13, electrical contacts 14, 15 for making a current flow in a laser, and a grating structure 16 for giving dispersion feedback. A grating structure 16 is so isolated from the core region such that electromagnetic radiation in a confined laser mode has intensity which is non-zero in the grating structure 16. The grating structure 16 is constituted so as to perform single-mode laser radiation.

公开(公告)号：JPH10144995A

公开(公告)日：1998-05-29

申请号：JP28032297

申请日：1997-10-14

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FEDERICO ,  CHO ALFRED YI ,  FAIST JEROME ,  HUTCHINSON ALBERT LEE ,  SCAMARCIO GAETANO ,  SIRTORI CARLO ,  SIVCO DEBORAH LEE

IPC: H01S5/00 ,  H01S5/34 ,  H01S5/343 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To provide a new type of QC(quantum cascade) laser. SOLUTION: A QC laser has first and second clad layers and a core region between the clad layers. The core region has a plurality of nearly equal multilayer semiconductor repeated units 11, and each repeated unit has an active region 12 and a carrier injection region 13. The active region has an superlattice region with an upper mini band 171 and a lower mini band 161, and a mini gap is formed between the upper mini band and the lower mini band. A carrier injection region is selected, so that carriers can be phase-shifted easily from the lower mini band of a certain repetition unit to the upper mini band of repetition unit at an adjacent downstream side. The active region is selected so that the wavelength ranges from 3 to 15μm.

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：JP2001244559A

公开(公告)日：2001-09-07

申请号：JP2000324946

申请日：2000-10-25

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FEDERICO ,  CHO ALFRED YI ,  CHU SUNG-NEE GEORGE ,  GMACHL CLAIRE F ,  KOEHLER RUEDEGER ,  SIVCO DEBORAH LEE ,  ALESSANDRO TOREDIKUCCHI

IPC: H01S5/125 ,  H01S5/042 ,  H01S5/10 ,  H01S5/12 ,  H01S5/34

Abstract: PROBLEM TO BE SOLVED: To offer an article comprising QC-DFB laser. SOLUTION: In the QC-DFB laser, an overlying grating structure achieves relatively strong coupling of the guided mode to the grating. The grating structure includes grooves etched in a plasmon-enhanced confinement layer(PECL) disposed adjacent and in contact with an upper metallic electrode. The grating structure and the PECL are designed such that in the grooves, 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, effective refractive index.

公开(公告)号：JP2000151026A

公开(公告)日：2000-05-30

申请号：JP29898099

申请日：1999-10-21

Applicant: LUCENT TECHNOLOGIES INC

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

IPC: H01L33/00 ,  H01S5/34 ,  H01S5/343

Abstract: PROBLEM TO BE SOLVED: To make effective inductive radiation in a plurality of wave lengths by making an energy interval of a central wave length larger than a line spreading energy of the first and the second whichever larger, and by providing a means of preventing buffering of electrons from a fourth level to a third level. SOLUTION: For example, a lower mini band 1 has a first and a second energy levels and an upper mini band 2 has a third and a fourth levels. Light is generated by a first autonomous radioactive ray having a central wave length λ1 and a first line spreading energy caused by an electron transition between the fourth and the first levels. Further, light is generated by a second autonomous radioactive ray having a central wave length λ2 and a second line spreading energy caused by an electron transition between the third and the second levels. An energy interval of the central wave length is larger than a larger line spreading energy of the first and the second and a means of preventing of a buffering of electrons from the fourth level to the third level.

公开(公告)号：JP2000101201A

公开(公告)日：2000-04-07

申请号：JP26801999

申请日：1999-09-22

Applicant: LUCENT TECHNOLOGIES INC

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

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

Abstract: PROBLEM TO BE SOLVED: To prebias an actual electronic potential by changing an SL cycle so as to make flat band conditions in the upper and lower mini-bands. SOLUTION: A semiconductor optical emitter 10 with a quantum cascade superlattice(QCSL) is provided with an upper clad area 16 and an active area 14 working as a lower clad area between the upper clad area 16 and a substrate 12. An insulation layer 18 is formed on the uppermost area of a device, and an opening is formed to expose a part of the uppermost area of a mesa by patterning. A first electrode 20 is formed in the opening in a manner that it is in contact with the insulation layer 18 and the upper clad area, and a second electrode 22 is formed on the substrate 12. A drive circuit is connected between the electrodes 20 and 22 so as to supply to a laser a pumping energy to generate light. The emitter 10 works as an incoherent natural radiation source at the threshold or less, while it works as a coherent stimulus radiation source at the threshold or more. In the case of the latter, when a feedback is given, the light source functions as a laser.

公开(公告)号：JPH11340586A

公开(公告)日：1999-12-10

申请号：JP12334099

申请日：1999-04-30

Applicant: LUCENT TECHNOLOGIES INC

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

IPC: H01S5/00 ,  H01S5/042 ,  H01S5/30 ,  H01S5/34 ,  H01S5/343 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To use a unit which is effective for monitoring contamination by collecting multiple identical repetitive units so as to form a waveguide core area, and constituting the repetitive units of injector areas and superlattice active regions. SOLUTION: A waveguide core region 13 is formed between a substrate/ lower-order optical close region 12 and a higher-order optical close region 14. The waveguide core area 13 is constituted by gathering multiple identical repetitive units. The repetitive units are constituted of injector regions which are injection/relief areas and superlattice active regions selected so that radiative carriers from a higher-order energy level to a lower-order energy level in the superlattice active region can easily be shifted. Thus, the diffusion of the carriers becomes less, an optical loss can be reduced, and the unit can used effectively be for monitoring of contamination.

公开(公告)号：JPH10275956A

公开(公告)日：1998-10-13

申请号：JP7633098

申请日：1998-03-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAPASSO FEDERICO ,  CHO ALFRED YI ,  FAIST JEROME ,  HUTCHINSON ALBERT LEE ,  SIRTORI CARLO ,  SIVCO DEBORAH LEE

IPC: H01S5/00 ,  H01S5/042 ,  H01S5/062 ,  H01S5/0625 ,  H01S5/34 ,  H01S5/343 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To make it possible to modulate a laser in an electric field in an IR intermediate wavelength range by a method wherein an active region is provided with a plurality of repetition units consisting of a plurality of layers, the laser oscillation transition of the laser is turned into the non-resonance tunneling transition of charge carries from a first quantum state to a second quantum state and the frequency of photons is set as the function of an electric bias. SOLUTION: In an article, which comprises a laser having first and second contacts to apply an electric bias to a semiconductor structure comprising an active region 12, the region 12 has a plurality of the same repetition units consisting of a plurality of layers in the directions intersecting orthogonal the contacts and is selected so that a laser oscillation transition of the laser is a non-resonance tunneling transition of charge carriers from a first quantum state to a second quantum state. This transition is achieved by radiation of photons of an hν of energy. Here, the (h) is the constant of a plank and the (ν) is the frequency of the photons. This frequency of the photons is the function of the electric bias, which is applied to the semiconductor structure, and the laser can be modulated in an electric field in an IR intermediate wavelength range.

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：CA2364797A1

公开(公告)日：2002-07-22

申请号：CA2364797

申请日：2001-12-11

Applicant: STEVENS INST TECHNOLOGY ,  LUCENT TECHNOLOGIES INC

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

IPC: H01S5/042 ,  H04B10/00 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H01S5/06 ,  H04B10/04

Abstract: A process for optically transmitting data to a remote receiver includes receiving a stream of input data signals and modulating a mid-IR laser by direct modulation with a waveform whose sequential values are responsive of the dat a signals of the stream. The direct modulation includes pumping the mid-IR las er to produce high and low optical power levels in response to different ones of t he values. The process also includes transmitting output light from the modulated mid-I R laser to the remote receiver via a free space communications channel.