Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep43806
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Categories
Funding
- National Science Foundation [ECCS-1505409, ECCS-1607838]
- Department of Homeland Security [HSHQDC-13-C-00034]
- Naval Air Systems Command [N68335-15-C-0072, N68936-15-C-0051]
- THz NASA's Space Technology Research Grants Program
- National Science Foundation [ECCS-1505409, ECCS-1607838]
- Department of Homeland Security [HSHQDC-13-C-00034]
- Naval Air Systems Command [N68335-15-C-0072, N68936-15-C-0051]
- THz NASA's Space Technology Research Grants Program
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1505409] Funding Source: National Science Foundation
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An efficient mid-infrared frequency comb source is of great interest to high speed, high resolution spectroscopy and metrology. Here we demonstrate a mid-IR quantum cascade laser frequency comb with a high power output and narrow beatnote linewidth at room temperature. The active region was designed with a strong-coupling between the injector and the upper lasing level for high internal quantum efficiency and a broadband gain. The group velocity dispersion was engineered for efficient, broadband mode-locking via four wave mixing. The comb device exhibits a narrow intermode beatnote linewidth of 50.5 Hz and a maximum wall-plug efficiency of 6.5% covering a spectral coverage of 110 cm(-1) at lambda - 8 mu m . The efficiency is improved by a factor of 6 compared with previous demonstrations. The high power efficiency and narrow beatnote linewidth will greatly expand the applications of quantum cascade laser frequency combs including high-precision remote sensing and spectroscopy.
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