Perfectly phase-matched third-order distributed feedback terahertz quantum-cascade lasers
We report a novel laser cavity design in third-order distributed feedback (DFB) terahertz quantum-cascade lasers based on a perfectly phase-matching technique. This approach substantially increases the usable length of the third-order DFB laser and leads to narrow beam patterns. Single frequency emi...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Optical Society of America
2014
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| Online Access: | http://hdl.handle.net/1721.1/86373 https://orcid.org/0000-0003-1982-4053 |
| Summary: | We report a novel laser cavity design in third-order distributed feedback (DFB) terahertz quantum-cascade lasers based on a perfectly phase-matching technique. This approach substantially increases the usable length of the third-order DFB laser and leads to narrow beam patterns. Single frequency emissions from 151 apertures (5.6 mm long device) are coherently added up to form a narrow beam with (FWHM ≈ 6 × 11°) divergence. A similar device with 40 apertures shows more than 5 mW of optical power with slope efficiency ~ 140 mW/A at 10 K pulsed operation. |
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