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    MODIFIED QUANTUM CASCADED LASER
    1.
    发明专利
    MODIFIED QUANTUM CASCADED LASER 失效

    公开(公告)号：JP2000012983A

    公开(公告)日：2000-01-14

    申请号：JP16456299

    申请日：1999-06-11

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BAILLARGEON JAMES NELSON ,  CAPASSO FEDERICO ,  CHO ALFRED Y ,  GMACHI CLAIRE F ,  HUTCHINSON ALBERT LEE ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO

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

    Abstract: PROBLEM TO BE SOLVED: To easily transport a large quantity of electrons through the injector of an injector region in each repeated unit having the injector region and an active area by sympathetically vibrating the low energy level of one active region with the high energy level of its downstream-side adjacent active area. SOLUTION: A quantum cascade laser 10 is composed of an InP substrate 11, a lower optically immobilized region 12, a waveguide core region 13, an upper optically immobilized area 14, and upper and lower contacts 15 and 16 with which the laser 10 is electrically brought into contact. The waveguide core region 13 is provided with many similar repeated units and each repeated unit is provided with an injector region and an active region. The injector region is made to sympathetically vibrate the lower energy level in the active region with the high energy level of the active region of its directly adjacent repeated unit on the downstream side under an appropriate electric bias, and the movement of charge carriers is carried out easily by selecting the quantum well layer and/or barrier layer of the injector region.

    DEVICE HAVING QUANTUM CASCADE LASER
    2.
    发明专利
    DEVICE HAVING QUANTUM CASCADE LASER 失效

    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.

    QUANTUM CASCADE LASER
    4.
    发明专利
    QUANTUM CASCADE LASER 失效

    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.

    MULTIPLE QUANTUM WELL LASER HAVING SELECTIVELY DOPED BARRIER
    5.
    发明专利
    MULTIPLE QUANTUM WELL LASER HAVING SELECTIVELY DOPED BARRIER 失效

    公开(公告)号：JP2000068611A

    公开(公告)日：2000-03-03

    申请号：JP22549899

    申请日：1999-08-09

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ANSELM KLAUS ALEXANDER ,  BAILLARGEON JAMES NELSON ,  CHO ALFRED Y

    IPC: H01S5/343 ,  H01S5/34

    Abstract: PROBLEM TO BE SOLVED: To reduce temperature dependency of laser characteristics by a method wherein numerous barriers include at least one doped barrier layer and it is insulated from an adjacent quantum well layer by an undoped barrier layer. SOLUTION: An active region includes numerous N-times repeated units 12 laminated between internal clads 20, 22 wherein each repeated unit includes a quantum well region adjacent to a barrier region 12.5. An active region of an MQW laser is modified so that each barrier region 12.5 includes numerous barrier layers. Among numerous barrier regions respectively, one barrier layer 12.3 is doped, while other two spacer barrier layers 12.2, 12.4 are undoped, whereby the doped barrier layer 12.3 is insulated from an adjacent quantum well region 12.1. The doped barrier layer 12.3 is preferably a thin delta-doped layer. On the other hand, the spacer barrier layers serve to essentially prevent a part of dopant atoms from diffusing into a quantum well.

    6.
    发明专利
    未知

    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

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

    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.

    8.
    发明专利
    未知

    公开(公告)号：DE69900427T2

    公开(公告)日：2002-06-27

    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

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

    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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