Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers
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 singl...
| Main Authors: | , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/97872 http://hdl.handle.net/10220/12199 |
| _version_ | 1811684547497033728 |
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| author | Khanna, Suraj P. Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Lim, Dau Fatt Tan, Chuan Seng Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Khanna, Suraj P. Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Lim, Dau Fatt Tan, Chuan Seng Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie |
| author_sort | Khanna, Suraj P. |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T04:30:22Z |
| format | Conference Paper |
| id | ntu-10356/97872 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:30:22Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/978722020-03-07T13:24:48Z Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers Khanna, Suraj P. Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Lim, Dau Fatt Tan, Chuan Seng Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences Photonics Global Conference (2012 : Singapore) A*STAR SIMTech Research Techno Plaza 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. 2013-07-25T04:17:15Z 2019-12-06T19:47:33Z 2013-07-25T04:17:15Z 2019-12-06T19:47:33Z 2012 2012 Conference Paper Liang, G., Liang, H., Zhang, Y., Khanna, S. P., Li, L., Davies, A. G., et al. (2012). Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers. 2012 Photonics Global Conference (PGC). https://hdl.handle.net/10356/97872 http://hdl.handle.net/10220/12199 10.1109/PGC.2012.6458023 en © 2012 IEEE. |
| spellingShingle | Khanna, Suraj P. Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Lim, Dau Fatt Tan, Chuan Seng Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title | Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_full | Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_fullStr | Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_full_unstemmed | Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_short | Single-mode narrow beam divergence surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_sort | single mode narrow beam divergence surface emitting concentric circular grating terahertz quantum cascade lasers |
| url | https://hdl.handle.net/10356/97872 http://hdl.handle.net/10220/12199 |
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