Journal
APPLIED PHYSICS LETTERS
Volume 119, Issue 11, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0061391
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Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
- National Science Foundation [1711892, 1810163, 2041165]
- Direct For Mathematical & Physical Scien [1810163] Funding Source: National Science Foundation
- Directorate For Engineering [2041165] Funding Source: National Science Foundation
- Division Of Materials Research [1810163] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [2041165] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1711892] Funding Source: National Science Foundation
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A new VECSEL external cavity design is demonstrated to transition from single/double-mode lasing to multi-mode lasing, with up to nine modes lasing simultaneously, paving the way for eventual frequency comb operation.
To date, terahertz quantum-cascade vertical-external-cavity surface-emitting lasers (QC-VECSELs) have tended to oscillate in only one or two lasing modes at a time. This is due to the fact that the interaction between all of the longitudinal external cavity modes and the QC gain material is mediated through a single metasurface resonance, whose spatial overlap changes little with frequency; this suppresses spatial-hole-burning induced multi-mode operation. In this Letter, a VECSEL external cavity is demonstrated using an output coupler based upon a high-resistivity silicon etalon, which presents a periodic reflectance spectrum that is nearly matched with the external cavity mode spectrum. As the cavity length is varied, a systematic transition between a single/double-mode lasing regime and a multi-mode lasing regime is realized due to the Vernier effect. Up to nine modes lasing simultaneously with a free-spectral-range of approximately 21 GHz is demonstrated. This result provides a path toward the multi-mode operation necessary for eventual frequency comb operation.& nbsp;Published under an exclusive license by AIP Publishing.
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