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：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：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.