Minimal group refractive index dispersion and gain evolution in ultra-broad-band quantum cascade lasers

Claire Gmachl; Alex Soibel; Raffaele Colombelli; Deborah L. Sivco; Federico Capasso; Alfred Y. Cho

doi:10.1109/LPT.2002.804677

Minimal group refractive index dispersion and gain evolution in ultra-broad-band quantum cascade lasers

Claire Gmachl
, Alex Soibel
, Raffaele Colombelli
, Deborah L. Sivco
, Federico Capasso
, Alfred Y. Cho

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

12 Scopus citations

Abstract

The group refractive index dispersion in ultra-broad-band quantum cascade (QC) lasers has been determined using Fabry-Pérot spectra obtained by operating the lasers in continuous wave mode below threshold. In the wavelength range of 5-8 μm, the global change of the group refractive index is as small as +8.2 × 10^-3 μm^-1 Using the method of Hakki and Paoli, the subthreshold gain of the lasers has furthermore been measured as a function of wavelength and current. At the wavelength of best performance, 7.4 μm, a modal gain coefficient of 16 cm·kA^-1 at threshold and a waveguide loss of 18 cm^-1 have been estimated. The gain evolution confirms an earlier assumption that cross-absorption restricted laser action to above 6 μm wavelength.

Original language	English (US)
Pages (from-to)	1671-1673
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	14
Issue number	12
DOIs	https://doi.org/10.1109/LPT.2002.804677
State	Published - Dec 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

Keywords

Mid-infrared
Quantum cascade (QC) laser
Semiconductor lasers
Semiconductor waveguides
Waveguide measurements

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10.1109/LPT.2002.804677

Cite this

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title = "Minimal group refractive index dispersion and gain evolution in ultra-broad-band quantum cascade lasers",

abstract = "The group refractive index dispersion in ultra-broad-band quantum cascade (QC) lasers has been determined using Fabry-P{\'e}rot spectra obtained by operating the lasers in continuous wave mode below threshold. In the wavelength range of 5-8 μm, the global change of the group refractive index is as small as +8.2 × 10-3 μm-1 Using the method of Hakki and Paoli, the subthreshold gain of the lasers has furthermore been measured as a function of wavelength and current. At the wavelength of best performance, 7.4 μm, a modal gain coefficient of 16 cm·kA-1 at threshold and a waveguide loss of 18 cm-1 have been estimated. The gain evolution confirms an earlier assumption that cross-absorption restricted laser action to above 6 μm wavelength.",

keywords = "Mid-infrared, Quantum cascade (QC) laser, Semiconductor lasers, Semiconductor waveguides, Waveguide measurements",

author = "Claire Gmachl and Alex Soibel and Raffaele Colombelli and Sivco, \{Deborah L.\} and Federico Capasso and Cho, \{Alfred Y.\}",

note = "Funding Information: Manuscript received April 26, 2002; revised July 19, 2002. This work was supported in part by DARPA/US ARO under Contract DAAD19-00-C-0096. The authors are with Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/LPT.2002.804677",

year = "2002",

month = dec,

doi = "10.1109/LPT.2002.804677",

language = "English (US)",

volume = "14",

pages = "1671--1673",

journal = "IEEE Photonics Technology Letters",

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T1 - Minimal group refractive index dispersion and gain evolution in ultra-broad-band quantum cascade lasers

AU - Gmachl, Claire

AU - Soibel, Alex

AU - Colombelli, Raffaele

AU - Sivco, Deborah L.

AU - Capasso, Federico

AU - Cho, Alfred Y.

N1 - Funding Information: Manuscript received April 26, 2002; revised July 19, 2002. This work was supported in part by DARPA/US ARO under Contract DAAD19-00-C-0096. The authors are with Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/LPT.2002.804677

PY - 2002/12

Y1 - 2002/12

N2 - The group refractive index dispersion in ultra-broad-band quantum cascade (QC) lasers has been determined using Fabry-Pérot spectra obtained by operating the lasers in continuous wave mode below threshold. In the wavelength range of 5-8 μm, the global change of the group refractive index is as small as +8.2 × 10-3 μm-1 Using the method of Hakki and Paoli, the subthreshold gain of the lasers has furthermore been measured as a function of wavelength and current. At the wavelength of best performance, 7.4 μm, a modal gain coefficient of 16 cm·kA-1 at threshold and a waveguide loss of 18 cm-1 have been estimated. The gain evolution confirms an earlier assumption that cross-absorption restricted laser action to above 6 μm wavelength.

AB - The group refractive index dispersion in ultra-broad-band quantum cascade (QC) lasers has been determined using Fabry-Pérot spectra obtained by operating the lasers in continuous wave mode below threshold. In the wavelength range of 5-8 μm, the global change of the group refractive index is as small as +8.2 × 10-3 μm-1 Using the method of Hakki and Paoli, the subthreshold gain of the lasers has furthermore been measured as a function of wavelength and current. At the wavelength of best performance, 7.4 μm, a modal gain coefficient of 16 cm·kA-1 at threshold and a waveguide loss of 18 cm-1 have been estimated. The gain evolution confirms an earlier assumption that cross-absorption restricted laser action to above 6 μm wavelength.

KW - Mid-infrared

KW - Quantum cascade (QC) laser

KW - Semiconductor lasers

KW - Semiconductor waveguides

KW - Waveguide measurements

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DO - 10.1109/LPT.2002.804677

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SP - 1671

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JO - IEEE Photonics Technology Letters

JF - IEEE Photonics Technology Letters

IS - 12

ER -

Minimal group refractive index dispersion and gain evolution in ultra-broad-band quantum cascade lasers

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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