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9 March 2022 Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs
Yu Wu, Sadhvikas Addamane, John L. Reno, Benjamin S. Williams
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Proceedings Volume PC12021, Novel In-Plane Semiconductor Lasers XXI; PC120210F (2022) https://doi.org/10.1117/12.2606690
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
A terahertz quantum-cascade VECSEL is demonstrated to exhibit multi-mode operation, despite the fact that spatial-hole burning is nominally suppressed within the amplifying metasurface. A specially designed output coupler mirror is used such that large numbers of modes have nearly identical lasing thresholds. Up to nine lasing modes with a FSR of approximately 21 GHz are demonstrated – a significant increase from previous QC-VECSELs in which only 2 or 3 modes have been observed to lase at once. This work is an intermediate step towards eventually demonstrating THz QC-VECSELs as broadband incoherent emitters or frequency combs.
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Yu Wu, Sadhvikas Addamane, John L. Reno, and Benjamin S. Williams "Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs", Proc. SPIE PC12021, Novel In-Plane Semiconductor Lasers XXI, PC120210F (9 March 2022); https://doi.org/10.1117/12.2606690
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KEYWORDS
Frequency combs
Output couplers
Reflectivity
Continuous wave operation
Fabry–Perot interferometers
Hole burning spectroscopy
Lasers
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