Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers
By introducing coupled microstrip antennas on THz Distributed Feedback (DFB) Quantum Cascade Lasers (QCLs), the radiation efficiency of each feedback aperture is greatly enhanced. Single mode emission ∼3 THz from a 31-period antenna-coupled third-order DFB laser yields ∼4 times improvement in output...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SPIE
2021
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| Online Access: | https://hdl.handle.net/1721.1/137750 |
| _version_ | 1811090761277505536 |
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| author | Kao, Tsung-Yu Cai, Xiaowei Hu, Qing Reno, John L. |
| author_facet | Kao, Tsung-Yu Cai, Xiaowei Hu, Qing Reno, John L. |
| author_sort | Kao, Tsung-Yu |
| collection | MIT |
| description | By introducing coupled microstrip antennas on THz Distributed Feedback (DFB) Quantum Cascade Lasers (QCLs), the radiation efficiency of each feedback aperture is greatly enhanced. Single mode emission ∼3 THz from a 31-period antenna-coupled third-order DFB laser yields ∼4 times improvement in output power comparing with a corrugated thirdorder device fabricated on the same gain medium. This 31-period device has ∼15×25° beam divergence and 4 mW pulsed power (4%) at 10 K with maximum lasing temperature (Tmax) at 134 K (pulsed). When phase matching condition is met, emissions from 81 apertures (4-mm long) are coherently combined to form a narrow beam with 12.5° divergence. Further experiment demonstrated the new device at 4 THz (25-period, ∼18 μm×1-mm long. The 4 THz device reaches >8 mW pulsed power (10%) at 12 K with Tmax109 K (pulsed) and >77 K (cw). The slope efficiency is 450 mW/A with 0.57% wall-plug. It is worth pointing out although the antennas would be excited differently, similar enhancement in out-coupling efficiency can also be observed in second-order surface-emitting THz DFB lasers. Begin the abstract two lines below author names and addresses.. © 2014 SPIE. |
| first_indexed | 2024-09-23T14:51:32Z |
| format | Article |
| id | mit-1721.1/137750 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:51:32Z |
| publishDate | 2021 |
| publisher | SPIE |
| record_format | dspace |
| spelling | mit-1721.1/1377502021-11-09T03:09:32Z Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers Kao, Tsung-Yu Cai, Xiaowei Hu, Qing Reno, John L. By introducing coupled microstrip antennas on THz Distributed Feedback (DFB) Quantum Cascade Lasers (QCLs), the radiation efficiency of each feedback aperture is greatly enhanced. Single mode emission ∼3 THz from a 31-period antenna-coupled third-order DFB laser yields ∼4 times improvement in output power comparing with a corrugated thirdorder device fabricated on the same gain medium. This 31-period device has ∼15×25° beam divergence and 4 mW pulsed power (4%) at 10 K with maximum lasing temperature (Tmax) at 134 K (pulsed). When phase matching condition is met, emissions from 81 apertures (4-mm long) are coherently combined to form a narrow beam with 12.5° divergence. Further experiment demonstrated the new device at 4 THz (25-period, ∼18 μm×1-mm long. The 4 THz device reaches >8 mW pulsed power (10%) at 12 K with Tmax109 K (pulsed) and >77 K (cw). The slope efficiency is 450 mW/A with 0.57% wall-plug. It is worth pointing out although the antennas would be excited differently, similar enhancement in out-coupling efficiency can also be observed in second-order surface-emitting THz DFB lasers. Begin the abstract two lines below author names and addresses.. © 2014 SPIE. 2021-11-08T18:07:03Z 2021-11-08T18:07:03Z 2013-12-18 2019-06-05T17:21:52Z Article http://purl.org/eprint/type/ConferencePaper https://hdl.handle.net/1721.1/137750 Kao, Tsung-Yu, Cai, Xiaowei, Hu, Qing and Reno, John L. 2013. "Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers." en 10.1117/12.2036604 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf SPIE SPIE |
| spellingShingle | Kao, Tsung-Yu Cai, Xiaowei Hu, Qing Reno, John L. Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title | Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title_full | Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title_fullStr | Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title_full_unstemmed | Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title_short | Microstrip-antenna-coupled distributed feedback terahertz quantum-cascade lasers |
| title_sort | microstrip antenna coupled distributed feedback terahertz quantum cascade lasers |
| url | https://hdl.handle.net/1721.1/137750 |
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