Journal
APPLIED PHYSICS LETTERS
Volume 121, Issue 19, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0107667
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Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
- National Science Foundation [2041165]
- National Aeronautics and Space Administration [80NSSC19K0700]
- U.S. Department of Energy (DOE) Office of Science
- Directorate For Engineering [2041165] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [2041165] Funding Source: National Science Foundation
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In this study, we demonstrated the continuous wave operation of a terahertz quantum-cascade vertical-external-cavity surface-emitting laser with the use of an external cavity and an off-axis paraboloid mirror. The device showed efficient lasing in the continuous mode with high output power and narrow linewidths.
We report continuous wave (cw) operation of a terahertz quantum-cascade vertical-external-cavity surface-emitting laser with an external cavity length of approximately 30 mm, benefited by an intra-cryostat focusing cavity. Compared to previous plano-plano cavities, an off-axis paraboloid mirror is introduced into the external cavity as a focusing element to reduce the diffraction loss and to enable cw lasing using small-area metasurfaces and long cavity lengths. The device shows lasing operation in the cw mode up to 111 K, and cw output power up to 11.5 mW at 77 K (0.5% wall-plug efficiency). A circular, directive beam pattern is collected, and free-running linewidths on the order of tens of kHz are measured over tens of seconds. Published under an exclusive license by AIP Publishing.
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