Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz
Design strategies for improving terahertz (THz) quantum cascade lasers (QCLs) in the 5–6 THz range are investigated numerically and experimentally, with the goal of overcoming the degradation in performance that occurs as the laser frequency approaches the Reststrahlen band. Two designs aimed at 5.4...
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-01-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2023-0726 |
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| author | Shahili Mohammad Addamane Sadhvikas J. Kim Anthony D. Curwen Christopher A. Kawamura Jonathan H. Williams Benjamin S. |
| author_facet | Shahili Mohammad Addamane Sadhvikas J. Kim Anthony D. Curwen Christopher A. Kawamura Jonathan H. Williams Benjamin S. |
| author_sort | Shahili Mohammad |
| collection | DOAJ |
| description | Design strategies for improving terahertz (THz) quantum cascade lasers (QCLs) in the 5–6 THz range are investigated numerically and experimentally, with the goal of overcoming the degradation in performance that occurs as the laser frequency approaches the Reststrahlen band. Two designs aimed at 5.4 THz were selected: one optimized for lower power dissipation and one optimized for better temperature performance. The active regions exhibited broadband gain, with the strongest modes lasing in the 5.3–5.6 THz range, but with other various modes observed ranging from 4.76 to 6.03 THz. Pulsed and continuous-wave (cw) operation is observed up to temperatures of 117 K and 68 K, respectively. In cw mode, the ridge laser has modes up to 5.71 THz – the highest reported frequency for a THz QCL in cw mode. The waveguide loss associated with the doped contact layers and metallization is identified as a critical limitation to performance above 5 THz. |
| format | Article |
| id | doaj-art-eb4a04ead89341b0b1bd5f062c3fdcfb |
| institution | DOAJ |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-eb4a04ead89341b0b1bd5f062c3fdcfb2025-08-20T02:49:30ZengDe GruyterNanophotonics2192-86142024-01-0113101735174310.1515/nanoph-2023-0726Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THzShahili Mohammad0Addamane Sadhvikas J.1Kim Anthony D.2Curwen Christopher A.3Kawamura Jonathan H.4Williams Benjamin S.5Department of Electrical and Computer Engineering, University of California, Los Angeles, CA90095, USASandia National Laboratories, Center of Integrated Nanotechnologies, MS 1303, Albuquerque, NM87185, USADepartment of Electrical and Computer Engineering, University of California, Los Angeles, CA90095, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA91109, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA91109, USADepartment of Electrical and Computer Engineering, University of California, Los Angeles, CA90095, USADesign strategies for improving terahertz (THz) quantum cascade lasers (QCLs) in the 5–6 THz range are investigated numerically and experimentally, with the goal of overcoming the degradation in performance that occurs as the laser frequency approaches the Reststrahlen band. Two designs aimed at 5.4 THz were selected: one optimized for lower power dissipation and one optimized for better temperature performance. The active regions exhibited broadband gain, with the strongest modes lasing in the 5.3–5.6 THz range, but with other various modes observed ranging from 4.76 to 6.03 THz. Pulsed and continuous-wave (cw) operation is observed up to temperatures of 117 K and 68 K, respectively. In cw mode, the ridge laser has modes up to 5.71 THz – the highest reported frequency for a THz QCL in cw mode. The waveguide loss associated with the doped contact layers and metallization is identified as a critical limitation to performance above 5 THz.https://doi.org/10.1515/nanoph-2023-0726quantum cascade laserterahertzreststrahlen bandgallium arsenidenonequilibrium green’s function |
| spellingShingle | Shahili Mohammad Addamane Sadhvikas J. Kim Anthony D. Curwen Christopher A. Kawamura Jonathan H. Williams Benjamin S. Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz Nanophotonics quantum cascade laser terahertz reststrahlen band gallium arsenide nonequilibrium green’s function |
| title | Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz |
| title_full | Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz |
| title_fullStr | Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz |
| title_full_unstemmed | Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz |
| title_short | Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz |
| title_sort | continuous wave gaas algaas quantum cascade laser at 5 7 thz |
| topic | quantum cascade laser terahertz reststrahlen band gallium arsenide nonequilibrium green’s function |
| url | https://doi.org/10.1515/nanoph-2023-0726 |
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