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    15.
    发明专利
    未知

    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.

    17.
    发明专利
    未知

    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

    IPC: H01S5/125 ,  H01S5/042 ,  H01S5/10 ,  H01S5/12 ,  H01S5/34 ,  H01S5/30

    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.

    19.
    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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