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Achieving both high power and high-quality beam pattern has been a longstanding challenge for terahertz (THz) quantum-cascade (QC) lasers largely due to their use of subwavelength metallic waveguides. Recently, the vertical-external-cavity surface-emitting laser (VECSEL) concept was demonstrated for the first time in the THz range and for a QC-laser. This is enabled by the development of an amplifying...
A terahertz quantum-cascade vertical-external-cavity surface-emitting laser (VECSEL) is demonstrated using an active focusing metasurface. This enables a hemispherical cavity with flat optics, which exhibits an excellent beam pattern and higher stability than a plano-plano cavity.
We report a terahertz metasurface quantum-cascade VECSEL laser without moving parts that can electronically switch between near-orthogonal linearly polarized output. It exhibits excellent beam pattern, single-mode operation, and power up to 93 mW at 77 K.
We report tuning of a terahertz quantum-cascade vertical-external-cavity surface-emitting-laser (VECSEL) using piezoelectric actuators and an intra-cryostat cavity. Continuous tuning over 260 GHz at a center frequency of approximately 3.3 THz is demonstrated
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