Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers

Guozhen Liang; Houkun Liang; Ying Zhang; Suraj P. Khanna; Lianhe Li; A. Giles Davies; Edmund Linfield; Dau Fatt Lim; Chuan Seng Tan; Siu Fung Yu; Hui Chun Liu; Qi Jie Wang

doi:10.1109/PGC.2012.6458023

Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers

Guozhen Liang, Houkun Liang, Ying Zhang, Suraj P. Khanna, Lianhe Li, A. Giles Davies, Edmund Linfield, Dau Fatt Lim, Chuan Seng Tan, Siu Fung Yu, Hui Chun Liu, Qi Jie Wang

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

Abstract

Single-mode surface-emitting terahertz quantum cascade lasers with second-order concentric-circular-gratings are firstly demonstrated. The gratings are designed for single-mode operation and surface emission for efficient and directional optical power out-coupling. The first structure exhibits single-mode operation over the entire dynamic range with a side-mode-suppression-ratio of around 30 dB, and a six-fold rotationally symmetric far-field pattern, while a modified structure demonstrates single-mode operation with an improved beam divergence, whose far-field patteren consists of two lobes, each of which has a beam divergence within 13.5°×7° (full-width at half-maximum, FWHM). In addition, the devices show a peak output power approximately three times higher than in conventional ridge-waveguide lasers of similar size, whilst maintaining similar threshold current densities and maximum operating temperatures.

Original language	English
Title of host publication	2012 Photonics Global Conference, PGC 2012
DOIs	https://doi.org/10.1109/PGC.2012.6458023
Publication status	Published - 1 Dec 2012
Event	2012 Photonics Global Conference, PGC 2012 - Singapore, Singapore Duration: 13 Dec 2012 → 16 Dec 2012

Conference

Conference	2012 Photonics Global Conference, PGC 2012
Country/Territory	Singapore
City	Singapore
Period	13/12/12 → 16/12/12

ASJC Scopus subject areas

Electrical and Electronic Engineering

More information

10.1109/PGC.2012.6458023

Cite this

Liang, G., Liang, H., Zhang, Y., Khanna, S. P., Li, L., Davies, A. G., Linfield, E., Lim, D. F., Tan, C. S., Yu, S. F., Liu, H. C., & Wang, Q. J. (2012). Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers. In 2012 Photonics Global Conference, PGC 2012 Article 6458023 https://doi.org/10.1109/PGC.2012.6458023

@inproceedings{83e6bc6622ad4ddd8d185a20f7ca3430,

title = "Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers",

abstract = "Single-mode surface-emitting terahertz quantum cascade lasers with second-order concentric-circular-gratings are firstly demonstrated. The gratings are designed for single-mode operation and surface emission for efficient and directional optical power out-coupling. The first structure exhibits single-mode operation over the entire dynamic range with a side-mode-suppression-ratio of around 30 dB, and a six-fold rotationally symmetric far-field pattern, while a modified structure demonstrates single-mode operation with an improved beam divergence, whose far-field patteren consists of two lobes, each of which has a beam divergence within 13.5°×7° (full-width at half-maximum, FWHM). In addition, the devices show a peak output power approximately three times higher than in conventional ridge-waveguide lasers of similar size, whilst maintaining similar threshold current densities and maximum operating temperatures.",

author = "Guozhen Liang and Houkun Liang and Ying Zhang and Khanna, {Suraj P.} and Lianhe Li and Davies, {A. Giles} and Edmund Linfield and Lim, {Dau Fatt} and Tan, {Chuan Seng} and Yu, {Siu Fung} and Liu, {Hui Chun} and Wang, {Qi Jie}",

year = "2012",

month = dec,

day = "1",

doi = "10.1109/PGC.2012.6458023",

language = "English",

isbn = "9781467325165",

booktitle = "2012 Photonics Global Conference, PGC 2012",

note = "2012 Photonics Global Conference, PGC 2012 ; Conference date: 13-12-2012 Through 16-12-2012",

}

Liang, G, Liang, H, Zhang, Y, Khanna, SP, Li, L, Davies, AG, Linfield, E, Lim, DF, Tan, CS, Yu, SF, Liu, HC & Wang, QJ 2012, Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers. in 2012 Photonics Global Conference, PGC 2012., 6458023, 2012 Photonics Global Conference, PGC 2012, Singapore, Singapore, 13/12/12. https://doi.org/10.1109/PGC.2012.6458023

Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers. / Liang, Guozhen; Liang, Houkun; Zhang, Ying et al.
2012 Photonics Global Conference, PGC 2012. 2012. 6458023.

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

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AU - Liang, Guozhen

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AU - Zhang, Ying

AU - Khanna, Suraj P.

AU - Li, Lianhe

AU - Davies, A. Giles

AU - Linfield, Edmund

AU - Lim, Dau Fatt

AU - Tan, Chuan Seng

AU - Yu, Siu Fung

AU - Liu, Hui Chun

AU - Wang, Qi Jie

PY - 2012/12/1

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N2 - Single-mode surface-emitting terahertz quantum cascade lasers with second-order concentric-circular-gratings are firstly demonstrated. The gratings are designed for single-mode operation and surface emission for efficient and directional optical power out-coupling. The first structure exhibits single-mode operation over the entire dynamic range with a side-mode-suppression-ratio of around 30 dB, and a six-fold rotationally symmetric far-field pattern, while a modified structure demonstrates single-mode operation with an improved beam divergence, whose far-field patteren consists of two lobes, each of which has a beam divergence within 13.5°×7° (full-width at half-maximum, FWHM). In addition, the devices show a peak output power approximately three times higher than in conventional ridge-waveguide lasers of similar size, whilst maintaining similar threshold current densities and maximum operating temperatures.

AB - Single-mode surface-emitting terahertz quantum cascade lasers with second-order concentric-circular-gratings are firstly demonstrated. The gratings are designed for single-mode operation and surface emission for efficient and directional optical power out-coupling. The first structure exhibits single-mode operation over the entire dynamic range with a side-mode-suppression-ratio of around 30 dB, and a six-fold rotationally symmetric far-field pattern, while a modified structure demonstrates single-mode operation with an improved beam divergence, whose far-field patteren consists of two lobes, each of which has a beam divergence within 13.5°×7° (full-width at half-maximum, FWHM). In addition, the devices show a peak output power approximately three times higher than in conventional ridge-waveguide lasers of similar size, whilst maintaining similar threshold current densities and maximum operating temperatures.

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BT - 2012 Photonics Global Conference, PGC 2012

T2 - 2012 Photonics Global Conference, PGC 2012

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ER -

Single-mode narrow beam divergence surface-emitting concentric-circular- grating terahertz quantum cascade lasers

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