Effect of waveguide sidewall roughness on the threshold current density and slope efficiency of quantum cascade lasers

Fatima Toor; Deborah L. Sivco; Hao E. Liu; Claire F. Gmachl

doi:10.1063/1.2962984

Effect of waveguide sidewall roughness on the threshold current density and slope efficiency of quantum cascade lasers

Fatima Toor, Deborah L. Sivco, Hao E. Liu, Claire F. Gmachl

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25 Scopus citations

Abstract

We report on a study to determine the effect of waveguide sidewall roughness on quantum cascade (QC) laser performance using two two-wavelength heterogeneous QC laser structures, one with emission wavelengths of 7.0 μm11.2 μm, and the other with 8.7 μm12.0 μm. For the range of roughness standard deviation values from about 0.4 to 1.0 μm, for which all four QC lasers were operating, the threshold current density increases by 12%-15% and the slope efficiency decreases by 30%-70% with stronger performance degradation for the shorter wavelength lasers, which is in agreement with a model based on Rayleigh scattering.

Original language	English (US)
Article number	031104
Journal	Applied Physics Letters
Volume	93
Issue number	3
DOIs	https://doi.org/10.1063/1.2962984
State	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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title = "Effect of waveguide sidewall roughness on the threshold current density and slope efficiency of quantum cascade lasers",

abstract = "We report on a study to determine the effect of waveguide sidewall roughness on quantum cascade (QC) laser performance using two two-wavelength heterogeneous QC laser structures, one with emission wavelengths of 7.0 μm11.2 μm, and the other with 8.7 μm12.0 μm. For the range of roughness standard deviation values from about 0.4 to 1.0 μm, for which all four QC lasers were operating, the threshold current density increases by 12%-15% and the slope efficiency decreases by 30%-70% with stronger performance degradation for the shorter wavelength lasers, which is in agreement with a model based on Rayleigh scattering.",

author = "Fatima Toor and Sivco, {Deborah L.} and Liu, {Hao E.} and Gmachl, {Claire F.}",

note = "Funding Information: This work was supported in part by MIRTHE (NSF-ERC).",

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doi = "10.1063/1.2962984",

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volume = "93",

journal = "Applied Physics Letters",

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AU - Toor, Fatima

AU - Sivco, Deborah L.

AU - Liu, Hao E.

AU - Gmachl, Claire F.

N1 - Funding Information: This work was supported in part by MIRTHE (NSF-ERC).

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Y1 - 2008

N2 - We report on a study to determine the effect of waveguide sidewall roughness on quantum cascade (QC) laser performance using two two-wavelength heterogeneous QC laser structures, one with emission wavelengths of 7.0 μm11.2 μm, and the other with 8.7 μm12.0 μm. For the range of roughness standard deviation values from about 0.4 to 1.0 μm, for which all four QC lasers were operating, the threshold current density increases by 12%-15% and the slope efficiency decreases by 30%-70% with stronger performance degradation for the shorter wavelength lasers, which is in agreement with a model based on Rayleigh scattering.

AB - We report on a study to determine the effect of waveguide sidewall roughness on quantum cascade (QC) laser performance using two two-wavelength heterogeneous QC laser structures, one with emission wavelengths of 7.0 μm11.2 μm, and the other with 8.7 μm12.0 μm. For the range of roughness standard deviation values from about 0.4 to 1.0 μm, for which all four QC lasers were operating, the threshold current density increases by 12%-15% and the slope efficiency decreases by 30%-70% with stronger performance degradation for the shorter wavelength lasers, which is in agreement with a model based on Rayleigh scattering.

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Effect of waveguide sidewall roughness on the threshold current density and slope efficiency of quantum cascade lasers

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