| ชื่อเรื่อง | : | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| นักวิจัย | : | Liang, Guozhen , Liang, Houkun , Zhang, Ying , Li, Lianhe , Davies, A. Giles , Linfield, Edmund , Yu, Siu Fung , Liu, Hui Chun , Wang, Qi Jie |
| คำค้น | : | DRNTU::Science::Physics::Optics and light. |
| หน่วยงาน | : | Nanyang Technological University, Singapore |
| ผู้ร่วมงาน | : | - |
| ปีพิมพ์ | : | 2556 |
| อ้างอิง | : | 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. , 1094-4087 , http://hdl.handle.net/10220/18734 , http://dx.doi.org/10.1364/OE.21.031872 |
| ที่มา | : | - |
| ความเชี่ยวชาญ | : | - |
| ความสัมพันธ์ | : | Optics express |
| ขอบเขตของเนื้อหา | : | - |
| บทคัดย่อ/คำอธิบาย | : | 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. ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) |
| บรรณานุกรม | : |
Liang, Guozhen , Liang, Houkun , Zhang, Ying , Li, Lianhe , Davies, A. Giles , Linfield, Edmund , Yu, Siu Fung , Liu, Hui Chun , Wang, Qi Jie . (2556). Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers.
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Liang, Guozhen , Liang, Houkun , Zhang, Ying , Li, Lianhe , Davies, A. Giles , Linfield, Edmund , Yu, Siu Fung , Liu, Hui Chun , Wang, Qi Jie . 2556. "Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers".
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Liang, Guozhen , Liang, Houkun , Zhang, Ying , Li, Lianhe , Davies, A. Giles , Linfield, Edmund , Yu, Siu Fung , Liu, Hui Chun , Wang, Qi Jie . "Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers."
กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print. Liang, Guozhen , Liang, Houkun , Zhang, Ying , Li, Lianhe , Davies, A. Giles , Linfield, Edmund , Yu, Siu Fung , Liu, Hui Chun , Wang, Qi Jie . Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.
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