Same-wavelength cascaded-transition quantum cascade laser

Xue Huang; Jingyuan L. Zhang; Vadim Tokranov; Serge Oktyabrsky; Claire F. Gmachl

doi:10.1063/1.4817737

Same-wavelength cascaded-transition quantum cascade laser

Xue Huang, Jingyuan L. Zhang, Vadim Tokranov, Serge Oktyabrsky, Claire F. Gmachl

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

1 Scopus citations

Abstract

Conventional Quantum Cascade (QC) lasers are based on intersubband transitions in repeated stages of precisely engineered quantum wells, with one electron emitting at most one photon in each stage. Here, we report on a same-wavelength cascaded-transition (SWCT) QC structure, with two subsequent optical transitions emitting at the same wavelength (λ ∼ 14.2 μm) in each stage. This SWCT QC gain medium was inserted between two conventional QC stacks, also at ∼14.2 μm. The measured laser power shows a quasi-saturation region with a 46% increase in slope efficiency after it. This quasi-saturation region is attributed to different current injection mechanisms.

Original language	English (US)
Article number	051113
Journal	Applied Physics Letters
Volume	103
Issue number	5
DOIs	https://doi.org/10.1063/1.4817737
State	Published - Jul 29 2013

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4817737

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title = "Same-wavelength cascaded-transition quantum cascade laser",

abstract = "Conventional Quantum Cascade (QC) lasers are based on intersubband transitions in repeated stages of precisely engineered quantum wells, with one electron emitting at most one photon in each stage. Here, we report on a same-wavelength cascaded-transition (SWCT) QC structure, with two subsequent optical transitions emitting at the same wavelength (λ ∼ 14.2 μm) in each stage. This SWCT QC gain medium was inserted between two conventional QC stacks, also at ∼14.2 μm. The measured laser power shows a quasi-saturation region with a 46% increase in slope efficiency after it. This quasi-saturation region is attributed to different current injection mechanisms.",

author = "Xue Huang and Zhang, {Jingyuan L.} and Vadim Tokranov and Serge Oktyabrsky and Gmachl, {Claire F.}",

note = "Funding Information: The authors gratefully acknowledge helpful advice and support from Igor Trofimov, Yamac Dikmelik, Jacob Khurgin, and William O. Charles. This work was supported in part by the Mid-Infrared Technologies for Health and the Environment (MIRTHE) centre (NSF-ERC). Copyright: Copyright 2013 Elsevier B.V., All rights reserved.",

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doi = "10.1063/1.4817737",

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AU - Tokranov, Vadim

AU - Oktyabrsky, Serge

AU - Gmachl, Claire F.

N1 - Funding Information: The authors gratefully acknowledge helpful advice and support from Igor Trofimov, Yamac Dikmelik, Jacob Khurgin, and William O. Charles. This work was supported in part by the Mid-Infrared Technologies for Health and the Environment (MIRTHE) centre (NSF-ERC). Copyright: Copyright 2013 Elsevier B.V., All rights reserved.

PY - 2013/7/29

Y1 - 2013/7/29

N2 - Conventional Quantum Cascade (QC) lasers are based on intersubband transitions in repeated stages of precisely engineered quantum wells, with one electron emitting at most one photon in each stage. Here, we report on a same-wavelength cascaded-transition (SWCT) QC structure, with two subsequent optical transitions emitting at the same wavelength (λ ∼ 14.2 μm) in each stage. This SWCT QC gain medium was inserted between two conventional QC stacks, also at ∼14.2 μm. The measured laser power shows a quasi-saturation region with a 46% increase in slope efficiency after it. This quasi-saturation region is attributed to different current injection mechanisms.

AB - Conventional Quantum Cascade (QC) lasers are based on intersubband transitions in repeated stages of precisely engineered quantum wells, with one electron emitting at most one photon in each stage. Here, we report on a same-wavelength cascaded-transition (SWCT) QC structure, with two subsequent optical transitions emitting at the same wavelength (λ ∼ 14.2 μm) in each stage. This SWCT QC gain medium was inserted between two conventional QC stacks, also at ∼14.2 μm. The measured laser power shows a quasi-saturation region with a 46% increase in slope efficiency after it. This quasi-saturation region is attributed to different current injection mechanisms.

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Same-wavelength cascaded-transition quantum cascade laser

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