Improved large optical cavity design for 10.6 μm (Al)GaAs quantum cascade lasers

G. Scarpa; N. Ulbrich; A. Sigl; M. Bichler; D. Schuh; M. C. Amann; G. Abstreiter

doi:10.1016/S1386-9477(02)00217-5

Improved large optical cavity design for 10.6 μm (Al)GaAs quantum cascade lasers

G. Scarpa, N. Ulbrich, A. Sigl, M. Bichler, D. Schuh, M. C. Amann, G. Abstreiter

Walter Schottky Institut

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We have developed an improved waveguide design for 10.6 μm (Al)GaAs quantum cascade lasers based on a large optical cavity. With the optical confinement based on the free-carrier plasma effect we accurately evaluate the complex dielectric constant as a function of doping densities of the GaAs waveguide layers. Free-carrier absorption losses and confinement factors are simulated and compared with experimental results. An improved design was obtained by varying the doping profile of the large optical cavity resulting in a 30% reduced threshold current density of 3.4 kA cm^-2 at 77 K heatsink temperature.

Original language	English
Pages (from-to)	844-847
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	13
Issue number	2-4
DOIs	https://doi.org/10.1016/S1386-9477(02)00217-5
State	Published - Mar 2002

Keywords

Infrared
Intersubband
Quantum cascade laser

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10.1016/S1386-9477(02)00217-5

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title = "Improved large optical cavity design for 10.6 μm (Al)GaAs quantum cascade lasers",

abstract = "We have developed an improved waveguide design for 10.6 μm (Al)GaAs quantum cascade lasers based on a large optical cavity. With the optical confinement based on the free-carrier plasma effect we accurately evaluate the complex dielectric constant as a function of doping densities of the GaAs waveguide layers. Free-carrier absorption losses and confinement factors are simulated and compared with experimental results. An improved design was obtained by varying the doping profile of the large optical cavity resulting in a 30% reduced threshold current density of 3.4 kA cm-2 at 77 K heatsink temperature.",

keywords = "Infrared, Intersubband, Quantum cascade laser",

author = "G. Scarpa and N. Ulbrich and A. Sigl and M. Bichler and D. Schuh and Amann, {M. C.} and G. Abstreiter",

year = "2002",

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T1 - Improved large optical cavity design for 10.6 μm (Al)GaAs quantum cascade lasers

AU - Scarpa, G.

AU - Ulbrich, N.

AU - Sigl, A.

AU - Bichler, M.

AU - Schuh, D.

AU - Amann, M. C.

AU - Abstreiter, G.

PY - 2002/3

Y1 - 2002/3

N2 - We have developed an improved waveguide design for 10.6 μm (Al)GaAs quantum cascade lasers based on a large optical cavity. With the optical confinement based on the free-carrier plasma effect we accurately evaluate the complex dielectric constant as a function of doping densities of the GaAs waveguide layers. Free-carrier absorption losses and confinement factors are simulated and compared with experimental results. An improved design was obtained by varying the doping profile of the large optical cavity resulting in a 30% reduced threshold current density of 3.4 kA cm-2 at 77 K heatsink temperature.

AB - We have developed an improved waveguide design for 10.6 μm (Al)GaAs quantum cascade lasers based on a large optical cavity. With the optical confinement based on the free-carrier plasma effect we accurately evaluate the complex dielectric constant as a function of doping densities of the GaAs waveguide layers. Free-carrier absorption losses and confinement factors are simulated and compared with experimental results. An improved design was obtained by varying the doping profile of the large optical cavity resulting in a 30% reduced threshold current density of 3.4 kA cm-2 at 77 K heatsink temperature.

KW - Infrared

KW - Intersubband

KW - Quantum cascade laser

UR - http://www.scopus.com/inward/record.url?scp=0036492701&partnerID=8YFLogxK

U2 - 10.1016/S1386-9477(02)00217-5

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SN - 1386-9477

VL - 13

SP - 844

EP - 847

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 2-4

ER -

Improved large optical cavity design for 10.6 μm (Al)GaAs quantum cascade lasers

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Keywords

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