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Title: Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
Authors: Liang, Guozhen
Liang, Houkun
Zhang, Ying
Li, Lianhe
Davies, A. Giles
Linfield, Edmund
Yu, Siu Fung
Liu, Hui Chun
Wang, Qi Jie
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2013
Source: Liang, G., Liang, H., Zhang, Y., Li, L., Davies, A. G., Linfield, E., et al. (2013). Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers. Optics express, 21(26), 31872-31882.
Series/Report no.: Optics express
Abstract: We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. 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 double-lobed profile, rather than the expected ring-shaped pattern.
ISSN: 1094-4087
DOI: 10.1364/OE.21.031872
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: A*STAR SIMTech
Rights: © 2013 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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