Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers

Guozhen Liang; Houkun Liang; Ying Zhang; Lianhe Li; A. Giles Davies; Edmund Linfield; Siu Fung Yu; Hui Chun Liu; Qi Jie Wang

doi:10.1364/OE.21.031872

Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers

Guozhen Liang, Houkun Liang, Ying Zhang, Lianhe Li, A. Giles Davies, Edmund Linfield, Siu Fung Yu, Hui Chun Liu, Qi Jie Wang

Research output: Journal article publication › Journal article › Academic research › peer-review

21 Citations (Scopus)

Abstract

We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circulargratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ̃30 dB. The device emits ̃5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as ̃13.5°×7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this doublelobed profile, rather than the expected ring-shaped pattern.

Original language	English
Pages (from-to)	31872-31882
Number of pages	11
Journal	Optics Express
Volume	21
Issue number	26
DOIs	https://doi.org/10.1364/OE.21.031872
Publication status	Published - 30 Dec 2013

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OE.21.031872

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title = "Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers",

abstract = "We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circulargratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as{\~ }30 dB. The device emits{\~ }5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as{\~ }13.5°×7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this doublelobed profile, rather than the expected ring-shaped pattern.",

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AU - Liang, Guozhen

AU - Liang, Houkun

AU - Zhang, Ying

AU - Li, Lianhe

AU - Davies, A. Giles

AU - Linfield, Edmund

AU - Yu, Siu Fung

AU - Liu, Hui Chun

AU - Wang, Qi Jie

PY - 2013/12/30

Y1 - 2013/12/30

N2 - We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circulargratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ̃30 dB. The device emits ̃5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as ̃13.5°×7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this doublelobed profile, rather than the expected ring-shaped pattern.

AB - We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circulargratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ̃30 dB. The device emits ̃5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as ̃13.5°×7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this doublelobed profile, rather than the expected ring-shaped pattern.

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DO - 10.1364/OE.21.031872

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JF - Optics Express

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Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers

Abstract

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