8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser
© 2017, OSA - The Optical Society. All rights reserved. We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized usin...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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The Optical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/134712 |
| _version_ | 1826202049022263296 |
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| author | Mirzaei, B Silva, JRG Hayton, D Groppi, C Kao, TY Hu, Q Reno, JL Gao, JR |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Mirzaei, B Silva, JRG Hayton, D Groppi, C Kao, TY Hu, Q Reno, JL Gao, JR |
| author_sort | Mirzaei, B |
| collection | MIT |
| description | © 2017, OSA - The Optical Society. All rights reserved. We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized using a third order distributed feedback (DFB) QCL with a single mode emission at 4.7 THz as the input. The measured diffraction efficiency of 74.3% is in an excellent agreement with the calculated result of 75.4% using a 3D simulation. We show that the power distribution among the diffracted beams is uniform enough for pumping an array receiver. To validate the grating bandwidth, we apply a far-infrared (FIR) gas laser emission at 5.3 THz as the input and find a very similar performance in terms of efficiency, power distribution, and spatial configuration of the diffracted beams. Both results represent the highest operating frequencies of THz phase gratings reported in the literature. By injecting one of the eight diffracted 4.7 THz beams into a superconducting hot electron bolometer (HEB) mixer, we find that the coupled power, taking the optical loss into account, is in consistency with the QCL power value. |
| first_indexed | 2024-09-23T12:01:04Z |
| format | Article |
| id | mit-1721.1/134712 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:01:04Z |
| publishDate | 2021 |
| publisher | The Optical Society |
| record_format | dspace |
| spelling | mit-1721.1/1347122023-02-24T17:16:25Z 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser Mirzaei, B Silva, JRG Hayton, D Groppi, C Kao, TY Hu, Q Reno, JL Gao, JR Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science © 2017, OSA - The Optical Society. All rights reserved. We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized using a third order distributed feedback (DFB) QCL with a single mode emission at 4.7 THz as the input. The measured diffraction efficiency of 74.3% is in an excellent agreement with the calculated result of 75.4% using a 3D simulation. We show that the power distribution among the diffracted beams is uniform enough for pumping an array receiver. To validate the grating bandwidth, we apply a far-infrared (FIR) gas laser emission at 5.3 THz as the input and find a very similar performance in terms of efficiency, power distribution, and spatial configuration of the diffracted beams. Both results represent the highest operating frequencies of THz phase gratings reported in the literature. By injecting one of the eight diffracted 4.7 THz beams into a superconducting hot electron bolometer (HEB) mixer, we find that the coupled power, taking the optical loss into account, is in consistency with the QCL power value. 2021-10-27T20:08:47Z 2021-10-27T20:08:47Z 2017 2019-06-05T18:05:37Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134712 en 10.1364/OE.25.029587 Optics Express Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf The Optical Society The Optical Society |
| spellingShingle | Mirzaei, B Silva, JRG Hayton, D Groppi, C Kao, TY Hu, Q Reno, JL Gao, JR 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title | 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title_full | 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title_fullStr | 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title_full_unstemmed | 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title_short | 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser |
| title_sort | 8 beam local oscillator array at 47 thz generated by a phase grating and a quantum cascade laser |
| url | https://hdl.handle.net/1721.1/134712 |
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