Terahertz quantum-cascade vertical-external-cavity surface-emitting laser with high-contrast grating output coupler

Дата публикации: 05-10-2026 00:00:00

We report a twofold increase in slope efficiency of a terahertz quantum-cascade vertical-external-cavity surface-emitting laser enabled by an all-dielectric high-contrast grating output coupler (OC). In contrast to a conventional metal-mesh OC on a quartz substrate, the dielectric grating eliminates losses associated with the metal. The device operates in pulsed and continuous-wave modes, with threshold current and maximum operating temperature comparable to those of the quartz-based OC. A circular beam pattern is maintained across the full tuning bandwidth.

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